The most common online errors (and how to fix them)

Sometimes when you try to visit a web page, you’re met with an HTTP error message. It’s a message from the web server that something went wrong. In some cases it could be a mistake you made, but often, it’s the site’s fault.

Each type of error has an HTTP error code dedicated to it. For example, if you try to access a non-existing page on a website, you will be met by the familiar 404 error.

Now, you might wonder, which are the most common HTTP errors that people encounter when they surf the Web? That is the question we’ll answer in this article.

Google to the Rescue

Why not let millions of web users tell us themselves what errors they encounter the most? In an indirect way we can do that via Google.

The basic idea here is that some of the people who encounter errors when they visit websites will want to know more about that error, and will go to the nearest search engine to do so.

In short, in this case, Google’s search statistics should be able to give us a pretty good idea of which HTTP errors are most common.

Using Google Insights for Search (a great tool for estimating the “popularity” of search terms) we went through all of the different HTTP error codes that exist, comparing them against each other. For this comparison, we chose the location “worldwide”, the period included all searches in 2018, and the type of search was limited to web search. When the dust settled from this little shootout, we had the top list that you can see here below.

Note: If you’re looking to better understand how Google works, be sure to read our analysis on how Google collects data about the Internet and its users.

The Top Five Errors, According to Google

Here they are, listed and explained in reverse order, the five most common HTTP errors. Drumroll, please…

5. HTTP Error 401 (Unauthorized)

This error happens when a website visitor tries to access a restricted web page but isn’t authorized to do so, usually because of a failed login attempt.

4. HTTP Error 400 (Bad Request)

This is basically an error message from the web server telling you that the application you are using (e.g., your web browser) accessed it incorrectly or that the request was somehow corrupted on the way.

3. HTTP Error 404 (Not Found)

Most people are bound to recognize this one. A 404 error happens when you try to access a resource on a web server (usually a web page) that doesn’t exist. Some reasons for this happening can for example be a broken link, a mistyped URL, or that the webmaster has moved the requested page somewhere else (or deleted it). To counter the ill effect of broken links, some websites set up custom pages for them (and some of those are really cool).

2. HTTP Error 403 (Forbidden)

This error is similar to the 401 error, but note the difference between unauthorized and forbidden. In this case no login opportunity was available. This can happen, for example, if you try to access a (forbidden) directory on a website.

And the most common HTTP error of all is……….

1. HTTP Error 500 (Internal Server Error)

The description of this error pretty much says it all. It’s a general-purpose error message for when a web server encounters some form of internal error. For example, the web server could be overloaded and therefore unable to handle requests properly.

Judging by Google’s search statistics, this problem is a lot more common than 404 errors.

Some Additional Comments on Website Errors

We would like to point out that all the error messages above are errors reported by the web server back to the visitor (that is the nature of HTTP errors; they come from the web server you are accessing).

Needless to say, if you can’t access a website at all—for example, if it’s network that is down—you won’t get an HTTP error back. Your connection attempt will simply time out.

We should add that the results from Google actually match our own data quite well. As you might know, we here at SolarWinds ® Pingdom ® monitor websites and servers for a living (you can set up your own account by clicking here). When helping customers with problems, we have often come upon the dreaded (and pretty vague) HTTP error 500, “internal server error.”

If you’re interested in delivering a top-notch experience for your website users, learn how to analyze and improve page load performance.

Note: This article first appeared on this blog back in 2009, and we have touched up the data since.

If you have a website, you’re going to encounter HTTP error codes at least once in your life.

There could be more than one reason for an HTTP error response code. It might occur because a web page is no longer available (404 not found) or because of a problem with the server (500 internal error).

In this post, I’m going to tell you what HTTP error codes are. This will help you better understand the HTTP responses.

After that, I will discuss the most common HTTP error codes along with some tips to fix each code.

What are HTTP error codes?

HTTP status codes are responses issued for a client’s request made to a server. For example, when your client (your web browser) tries to connect to your WordPress site (the server).

Based on how the request is handled, the server shows different responses. These responses include redirects, server errors, client errors, and others as such. HTTP error codes are not part of web pages; instead, they are responses from servers about how the request is handled.

Not all HTTP status codes indicate errors. For example, some just communicate that a page has been moved, either permanently or temporarily. But if you are experiencing errors, the HTTP error codes that you see will help you figure out what the problem is.

Now that you know what it is, let’s dig into some of the most common HTTP error codes and status codes and how to fix them.

Seven most common HTTP error codes and status codes

“401 Unauthorized”

First on our list of HTTP error codes is 401. A 401 message means the server received an unauthenticated request.

In this error, a message announces that the page couldn’t load because of invalid credentials for whatever reason.

How to fix it?

It could be possible the login URL has changed, or the URL you entered is incorrect. However, if that’s not the case, try clearing the browser cache and cookies.

“404 Not Found”

A 404 status code is a common HTTP error code on the internet. This HTTP response is generated when a page the user is looking for cannot be found on the server. There could be multiple reasons behind 404 occurrences. Perhaps because the webmaster has deleted the page or the URL you have entered is incorrect (since it’s a client-side error).

How to fix it?

Fixing a broken link (or, more specifically, a 404) is still an essential maintenance task. If you are glutton for work and won’t mind taking the longer route, use the .htaccess method. But a more natural way to do this is by installing the Redirection plugin from the WordPress directory. You can then redirect it to any webpage on the site.

“500 Internal Server Error”

A 500 Internal Server Error is a generic error that displays when something is wrong with your server. Because it’s a generic error message, there are a number of different causes including issues with WordPress plugins, PHP issues, database problems, and more.

How to fix it?

Fixing the 500 Internal Server Error is a bit onerous as more than one reason is to blame for its occurrence. You’ll probably want to read the full guide for this one.

“502 Bad Gateway”

Unlike other HTTP error codes, 502 is different. A bad gateway occurs when one server on the internet receives an invalid response from another server. A 502 HTTP status code will be tacked on a screen when the server takes longer than expected to complete a request.

How to fix it?

Most of the time this can be fixed by simply refreshing the browser, or clearing the browser cache. If you have just migrated to the site, try waiting for 24 to 48 hours. You can even reach out to the hosting provider to check with them. Sometimes, a third-party CDN service or WordPress plugin could be the reason behind your 502 response. Try switching the WordPress theme to another if the fixes mentioned above don’t work.

“301 Moved Permanently”

An HTTP 301 is when a specific webpage is permanently moved to a different URL. It’s not an error per se, but it does communicate important information.

It can be on a page-level where you get pointed on another similar post (or even homepage for that matter) or a domain level.

How to fix it?

To make sure the redirection is flawless, check the redirect setup. If you have used a WordPress plugin, try switching it with Redirection. If you used the .htaccess file to perform the redirection, verify that you did it correctly. Here’s how to do that. Keep the domain level redirection for a few months, so Google knows the resource is moved permanently.

“302 Found”

This HTTP status code is similar to the 301, but it is used for a temporary redirect. This response tells Google that the page is moved temporarily and will be back to the original URL at some point. If done correctly, it will redirect the user to another URL in a couple of seconds.

How to fix it?

The easiest way to set up a 302 redirect is by using a WordPress plugin. You can install and use Rank Math from the WordPress directory.

“410 Gone”

This 410 Gone error is similar to the 404 response. Think of this as a permanent 404. When a webmaster decides to remove a post or page forever or republish it on another site, they can use this code.

A 410 response tells Google the requested resource is permanently removed from the internet and will not reappear. This makes it easier to get the page de-crawled or de-indexed from Google.

How to fix it?

There are multiple reasons behind a 410 gone error. First, check the input URL and make sure it’s correct. Next, try debugging the update on the WordPress website. Uninstall the WordPress plugins or other third-party extensions. If none of this works, then it’s a problem from the server end. Find the .htaccess file. Next, locate the word “RewriteXXX” in the .htaccess text editor and enter the following code:

When entering the code, replace [http://yourwebsitename.con/expired_page] with the URL that is expired, or where you’d like to add 410 responses.


Now that you learned about the most common HTTP error codes and status codes, it’s time to fix them on your site and improve your site’s user experience and SEO.

There are also some other ways to improve how your site works with HTTP error codes. For example, you could create a custom 404 page that visitors will see when they try to visit a page that doesn’t exist.

Do you have any questions about HTTP status codes? Are you seeing an error and confused about what it means? Let us know in the comments!

There can be a million reasons why people don’t buy from a website, but statistically speaking, you only need to identify and fix a few of those reasons to get back most of the revenue you’re currently missing out on.

In this article, we are going to show you the most common mistakes, like

  • Not personalizing your site properly
  • Confusing product benefits with product features
  • Not trusting your own product
  • Hiding your real prices

The most common online errors (and how to fix them)

If you take all of the steps we recommend, you will likely be able to cut your abandonment rates down to a fraction of what you’re currently experiencing.

The most important online shopping and eCommerce statistics for online retailers

There are hundreds of articles, research papers, and reports out there where you can find up-to-date statistics on eCommerce sites. But this isn’t one of them, so here we will only be focusing on a few universal, key stats that will help put the most common online shopping problems into context.

For starters, Forrester Research tells us that around 50%of potential sales are lost simply because visitors are unable to find what they are looking for on eCommerce sites. Also, at least 45% of US customers will abandon a purchase if they have a question about the product or the shopping process and aren’t able to easily find the answer.

What these numbers tell us is that it’s essential for online shoppers to find everything quickly and easily in order to enable them to make a purchase, and increase your sales and revenue.

We also know that, according to Business2Community, around 86% of online shoppers are willing to pay more for a smoother, better shopping experience, and 49% of them are likely to impulse buy when they receive one.

There are a lot of very simple ways to provide this, many of which we will be talking about in this article.

Let’s start by keeping these in mind – and the fact that a good user and customer, experience is probably the most important thing for online merchants.

We explain what this networking error means for users and website owners

The most common online errors (and how to fix them)

Among the many server status codes that internet users sporadically run into, a ‘502 bad gateway’ error is one of the most common. Very rarely does an error of this kind indicate an issue with the user or their equipment at home or in the office, although it can be in very rare situations with faults in individual computers or Wi-Fi connections.

More commonly, though, if you’re seeing a ‘502 bad gateway’ error it usually means that there is an issue with the server hosting the website you’re trying to access. Specifically, it is often caused by issues with the gateway, or the proxy server might be encountering communication issues with the upstream or original server.

This is both a good and bad indicator for the user; good because there are no remediating actions to implement or understand, but it’s bad news in the sense that there isn’t much a user can do in order to speed up the connection process. In this case, it’s usually a case of having to wait until whatever issue is affecting the website’s server has been resolved.

That said, there are a few useful tricks to know that are worth trying in the event they can help restore a connection to the website, and you can read all about them below if you’re interested in trying them for yourself.

What causes a 502 Bad Gateway error?

Server overload: An overloaded server is one of the most common causes of a 502 error. This is where the server has reached its memory capacity, often activated by an unusually high number of visitors trying to access the same website. This can just be a coincidence, or maybe driven by a big event, but it can also be a targeted DDoS attack.

Request blocked by a firewall: With cyber criminals finding more and more ways to breach corporate networks, firewalls continue to play a key role in stopping them in their tracks. However, a number of firewalls can often go further than you’d like and inadvertently treat a massive influx of legitimate users as an attempted cyber attack. This can often occur with DDoS protection layers, which block requests from content deliver systems and cause the network to grind to a halt.

Faulty programming: Often enough, a glitch or coding error in a website’s code might result in requests not being answered correctly, sparking the 502 Bad Gateway error to show up.

The top three IT pains of the new reality and how to solve them

Driving more resiliency with unified operations and service management

The most common online errors (and how to fix them)

Free download

Network errors: There are a multitude of potential networking errors that may occur, including potential DNS issues, routing problems, as well as issues relating to your Internet Service Provider (ISP). An ISP, for example, may have decided to block a certain web address.

Server software timeouts: The error can also show for users when a web server takes longer than expected to return a request, and the caching tool reaches its time values. Slower queries can also cause this problem.

How to fix a 502 Bad Gateway error

There are a number of key steps that users can take to attempt to fix a 502 Bad Gateway error.

  1. Refresh your browser: Refresh your browser: One of the simplest tricks that can help resolve the issue is to refresh the browser a few times. The error can sometimes be displayed as a result of a server becoming overloaded with requests – an issue that is often resolved quickly. Refreshing the browser and sending new requests to the website can help rest the connection and get your browsing back up and running again.
  2. Clear your browser cache: Every browser is different but modern browsers such as Chrome, Firefox, Safari and Microsoft Edge make it easy to find this setting, often located in the browser history section. Clearing the cache is another effective way to overcome 502 bad gateway errors so it’s worth trying, just in case.
  3. Temporarily disable your firewall: We’ll preface this by saying that a firewall should always be active and it is not recommended to disable it for any significant length of time. But in some cases, disabling it and successfully re-attempting to connect to the website may indicate a problem with the firewall’s settings, which can be usually altered through the admin console of your security provider.
  4. Check with monitoring sites: If this doesn’t work, you could always turn to online services such as Down for everyone or just me? or Down detector. These monitor the web for any outages and allow users to report any problems they may be encountering. If it’s an issue affecting not just you, then the chances are others will have reported it, and the more people reporting problems, the more likely it’s a prolonged issue.
  5. Use a VPN to access the site: There are various online virtual private networks (VPNs) such as Hide My Ass and others that can reroute your connection before you access the site. This means you’ll be able to figure out whether any issues may have popped up with your ISP, for example, when ISPs block access to certain sites for any particular reason.
  6. Examine web server logs: If this error persists, it may require some further investigation to find a solution. Examining web server logs at the time of the error occurring will be a good place to start. If you are the owner of the website, you can check your FQDN (fully qualified domain name) is correctly resolving. You can also check a server is reachable via a ping text or traceroute.

Building data-driven government with the Microsoft Power Platform

How to break down data silos and reap valuable data insights

The most common online errors (and how to fix them)Free Download

Improve security and compliance

Adopting an effective security and compliance risk management approach

The most common online errors (and how to fix them)Free Download

Taking the lead on IT automation

IT leaders as evangelists for their automation strategies

The most common online errors (and how to fix them)Free Download

The best defence against ransomware

How ransomware is evolving and how to defend against it

The most common online errors (and how to fix them)Free download

The latest advancements in collaboration software, UC as a service, contact centers and virtual reality await attendees of this .

Even as the pandemic ebbs, virtual events will remain a primary way to reach employees and customers — but make sure you’re .

It can be difficult to make sense of popular cloud communications service models. Compare UCaaS vs. CCaaS vs. CPaaS to understand.

Cisco’s MV Sense is available as a subscription with Meraki MV cameras. Companies can use the service to count boxes in a .

Mobile phishing is a significant threat, and there are many statistics that back this up. Find out what these numbers mean and .

The latest Android update will sort text messages as business or personal and send reminders for unanswered messages. The update .

Intel is optimistic its processor roadmap can put the company back on top, but the company faces the challenging prospect of .

Safety in the data center requires organizations to identify and address a variety of risk factors, from electrical systems to .

Recent advancements in data center technology and staffing models reflect organizations’ desire for increased IT agility, .

Partner executives called the makeover, which creates new tiers and revises qualification criteria, the first major program .

AIOps is still early in development; however, the technology will help channel partners and customers contextualize large volumes.

Channel companies collaborate with technology providers, creating differentiated offerings that address customer demand for .

The most common online errors (and how to fix them)

We’ve all been there. when you visit a website and you get hit with a three-digit number SMACK in the face. For most, those 3 little numbers mean very little, but it’s definitely worth knowing the most common error codes so you can at least know if your favourite website is down forever, or will be returning in the next five minutes. Equally, if you’re a website owner, marketer, salesperson, IT specialist, or anyone in between, you should definitely know what the error codes mean, and how easy they are to fix.

Why do websites get error codes?

The reason websites get these infamous error codes is actually pretty simple – no website jargon dictionary needed. For example, when we’re looking for a website, as soon as we search for a URL, the server the URL is connected through will send a response. When there is an issue, we get one of the error codes below and they all indicate a certain issue that the URL or website is having. These can be split into 2 different types of error messages, the client-side (user trying to access the site), and the server-side (the issues with the server).

Error codes and what they mean

Error code: 400

A 400 error code relates to an issue with the browser. This occurs when the message is identified as corrupt and the request which the server receives cannot respond with the correct requested information.

Error code: 401

This error code is related to authorisation credentials. It will usually appear when the user does not have authorisation to enter the page. Luckily, this is something that can be tackled by the user in a few easy steps – sometimes it’s just the cache that needs to be cleared from a browser, and then a trusty old refresh of the chosen page.

Error code: 403

A 403 error code is another code that relates to permission. This message will usually appear with the above error code when a user has signed in but does not have permission to access the requested page.

Error code: 404

The most famous and well-known error code of them all – the 404. This is a response from the server informing the user that it cannot find the page they are looking for. It’s an indicator of the page not working properly and needs to be fixed. For a website owner, the silver lining to this page is that it’s a great opportunity to make the message into something fun and engaging that could potentially go viral!

Error code: 408

Unlike the other error codes, this is a time-out code that the user might have caused by stopping the request before the server has retrieved the information. It can also be an indicator of a slow-running server so it’s best to monitor the server if this message appears.

Error code: 500

Like the 404 error code for customers, 500 is the most common error code internally for those monitoring server issues. It usually indicates an issue with the user request not being able to communicate with the server which results in an error 500 message appearing.

Error code: 502

This error message indicates something more serious with the server connection. It’s a connectivity issue as the server the user is requesting the information from is not connected and indicates a Bad Gateway problem. A solution to this would be to use a server monitoring tool that can alert you when the server goes down.

Error code: 503

If your website is currently offline the users trying to access the server will get this error code. Usually, this occurs when there is planned maintenance work or unplanned downtime on the server.

Error code: 504

The timeout error occurs when the server is taking longer than the required period for a response. This error message is generated in this case and it could be an indicator that there is an issue with the server or simply a one-off issue that caused the response time to take longer than usual.

These are just some of the common error codes that you’ll see, both internally and externally. It’s important to know from a customer and from a website owner’s viewpoint what these mean, how they affect customer behaviour, and what can be done to fix them. There are plenty of tools out there that can help minimise these issues, or at least, identify them for you so you can make sure to do something about them. Like StatusCake. Find out everything you need to know about setting up a completely free account here!

On the surface, the contrast between micro apps and microservices simply seems a matter of front-end vs. back-end concerns. But .

IDPs can provide a productive and secure environment for development teams. Consider the pros and cons to see if an internal .

While there are a variety of ways to develop cloud-native microservices, focus on strategies that enable as much agility, .

UX design sprawl mimics urban sprawl, both in its push for growth and its potentially dangerous pitfalls. Here are a few things .

Code smells can be the canary in the coal mine for poor coding. And poor coding is a sign that refactoring is called for. Let’s .

To successfully outsource an Agile development practice, organizations must prioritize communication and provide ample onboarding.

To achieve high availability and fault tolerance in AWS, IT admins must first understand the differences between the two models.

Amazon ECS and EKS are similar, but their differences are enough to set them apart for AWS users. Learn which best fits your .

New storage additions such as Flexible Block Volumes and high availability for ZFS grow Oracle’s cloud platform to compete .

A popular JavaScript package was sabotaged by its developer and seeded with messages in support of Ukraine in what has become a .

Trend Micro discovered that the Cyclops Blink botnet, which had originally targeted WatchGuard devices, is now spreading to Asus .

The mysterious LokiLocker ransomware group caught the attention of BlackBerry researchers, who say the outfit could become the .

Think you’re ready for the AWS Certified Solutions Architect certification exam? Test your knowledge with these 12 questions, and.

Amazon said its van monitoring system is designed solely for driver safety. But many industry experts have concerns regarding the.

Amazon would like to strengthen its global footprint, but the e-commerce giant faces roadblocks and challenges today that did not.

The most common online errors (and how to fix them)

One of the most common errors on the web — so common it’s slipped into non-internet slang — is the 404 error.

Also known by its longer name, “404 Page Not Found,” this is an error that indicates that the page or resource you’re looking for can’t be found. This usually means that it’s been deleted or moved.

What you need to know about 404 errors

404 errors are common, and if you’re reading this, there’s a good chance you’ve encountered one before. Most people find them when they try to go to a specific webpage that doesn’t exist anymore.

What’s happening is simply that your browser is asking a website to display something, the website can’t find the right page to display, so it gives you an error instead.

Nearly every website has the potential to give you 404 errors. It’s the easiest way to tell a user that they’re in the wrong place. Even Business Insider has its own 404 pages, which display when you try to visit a page that doesn’t exist.

That said, compared to the early days of the internet, finding 404 errors isn’t as easy as it used to be. There are two reasons for this:

  • Most major websites now redirect users away from 404 pages automatically. If a website is planning to delete or unpublish a webpage, that page now usually gets redirected to a different page. As a visitor, you might not end up on the exact page you requested, but you won’t be stranded on a 404 error page, either. As a result, there are fewer “broken” pages than there once were.
  • Many websites now have their own custom 404 pages, which help users more easily find what they’re looking for. In some cases, these pages are so UI-friendly that it’s hard to tell you’ve even hit a 404 error.

What you can do about 404 errors

If you receive a 404 error when trying to reach a particular webpage, it’s not always clear what went wrong. Here are some ways you can try to resolve a 404 error:

  • Double-check the URL you’ve entered, especially if you typed it by hand. You might have made a simple typo.
  • Refresh the webpage. 404 errors may be momentary glitches that you can resolve by refreshing your web browser on a page.
  • Use Google (or a similar search engine) to try and find the page again. It may have moved to a different URL.
  • Try to get there on another device. If you have another computer, phone, or tablet available, try the page there. If you can see the webpage from another device, it’s probably a problem with your computer’s cache. Clear the cache and try again.
  • Use theInternet Archive’s Wayback Machine. The Wayback Machine is a free utility that lets you see what specific URLs would look like at various points in the past. If you know that the page you’re looking for was around for a while, there’s a good chance that the Wayback Machine has it saved.
  • Contact the webmaster or site owner. If you’re trying to reach a page on a small website, the site manager probably wants to know if there are broken links on the site, because a significant number of 404 errors can damage the website’s reputation and search engine ranking.

If you’re getting reports of 404 errors on a site that you manage, make sure that no pages have been deleted accidentally, and that all your links and buttons lead to the correct URLs. You can use free tools like Dead Link Checker to find your broken links and missing pages.

The most common online errors (and how to fix them)

So you have encountered a 403 Forbidden error and you are wondering what it means.

This error is an HTTP status code which means that you are forbidden from accessing the page or resource that you are trying to reach. Unless you are the person who created the website, there is often nothing you can do. However, there are a few things that might help.

It is possible the creator of the website set up the permissions correctly and is intentionally forbidding you from accessing the page. But this error could also indicate that the website was set up incorrectly.

Here are some things you can try to fix the 403 Forbidden error.

? Verify and refresh

First verify that the URL is correct and refresh the page. This is the first thing you should do when you encounter any error on a website.

Most web servers are set up to return a 403 Forbidden error if someone tries to access a directory on the server instead of a file (like an HTML file). So you may have typed in the URL incorrectly and are trying to access a directory.

? Clear browser cache

A cached version of the page could be causing the issue. Here are shortcut keys that will clear the browser cache on most browsers:

  • Windows: CTRL + F5
  • Mac/Apple: Apple + Shift + R or Command + Shift + R

⌨️ Log in

It is possible that the page you are trying to access requires you to log in. If so, make sure to log in to get additional access.

? Clear cookies

Clearing your browser’s cookies can sometimes help. This is especially true if the site usually requires a log in, and if logging out and in does not solve the problem.

? Contact the website

It is possible the website has been set up incorrectly and the creator of the website is not aware. Other people could be getting this same error. Try to find the contact information for the website and let them know about the problem. It could be a simple fix on their end.

?️ Come back later

Often 403 Forbidden errors are caused by an issue with the website. It is possible that the website developers are currently working on a fix. If you just try again at a later time, the problem could be fixed.

For web developers only

If you are the creator of the page that is giving a 403 Forbidden error, then it is your job to fix the error on the server. The two most common reasons for the error are no index page and incorrect permissions.

Make sure the you have a file called index.htm or index.php in the location that is showing the error. For instance, if the URL is showing the error, make sure that the directory named forbidden on your server has an index.htm or index.php file located in it.

The next thing to look into is the permissions on the files that are creating the error. Here is how the permissions should usually look:

  • Folders: 755
  • Static Content: 644
  • Dynamic Content: 700

I’m a teacher and developer with I run the YouTube channel.

If you read this far, tweet to the author to show them you care. Tweet a thanks

Learn to code for free. freeCodeCamp’s open source curriculum has helped more than 40,000 people get jobs as developers. Get started

freeCodeCamp is a donor-supported tax-exempt 501(c)(3) nonprofit organization (United States Federal Tax Identification Number: 82-0779546)

Our mission: to help people learn to code for free. We accomplish this by creating thousands of videos, articles, and interactive coding lessons – all freely available to the public. We also have thousands of freeCodeCamp study groups around the world.

Donations to freeCodeCamp go toward our education initiatives, and help pay for servers, services, and staff.

It’s not uncommon to see these types of errors while you’re surfing the web, but when you find one on your own website, suddenly you’ve got a problem. In this blog post, we’ll go over what a 404 error message means, what it means for your marketing efforts, why websites get them, and what you can do to fix any you may encounter on your industrial website.

What Is A 404 Error And Why Can’t The Pages Open?

The most common online errors (and how to fix them)

A 404 error message is a Hypertext Transfer Protocol (HTTP) status code indicating the server could not find the requested website. In other words, your web browser can connect with the server, but the specific page you’re trying to access can’t be reached. There are other kinds of HTTP errors, but 404 errors are the most common and it’s a signal that the webpage does not exist. It is likely a page was moved and it was an oversight to redirect the page to a new one. It can appear in any browser.

Other Ways A 404 May Be Displayed

Different browsers and servers may use slightly varied terminology when delivering a 404 message, but it all means the same thing. Here are some of the most common ways you’ll see this error displayed:

The requested URL was not found on this server

Error 404 Not Found

404 File or Directory Not Found

HTTP 404 Not Found

404 Page Not Found

The most common online errors (and how to fix them)

How To Fix A 404 Error

Chances are, you have some 404 errors on your site. That’s normal — most websites will have 404 errors at some point in time — but it’s important for you to continually find them, and fix them, as expeditiously as possible. Now, the most important part: What can you do on your end to get rid of a 404 error? Here are the steps you can take.

  • Redirect the page: The easiest and most simple way to fix a 404 error is to redirect the page to another one, using a “301” redirect. A 301 is a response code that signals to a user’s browser that your content has moved to a new url.
  • Correct the link: We’re all human, and typos can happen — even when creating hyperlinks. If this is the case, go back and fix the URL.
  • Restore deleted pages: It’s imperative for industrial companies to continually update and fine-tune their sites. Occasionally, this can mean deleting a page. However, just because you remove a page from your site, that doesn’t stop people from searching for it, or clicking on links from old, outdated collateral. When deleting pages, be sure to redirect them to pages with similar content.

And here are some online tools available to help you with the 404 error fixing process:

  • Google Search Console: The easiest way to find 404 errors is via Google Search Console. If you’ve already verified your site, then Google is already crawling it. You just need to log into your account, click the “Crawl” dropdown menu, and click on “Crawl Errors.”
  • Screaming Frog SEO Spider:SEO Spider from Screaming Frog is a bit more intuitive and user friendly than Google Search Console. However, some of the more robust features required a paid subscription.
  • Broken Link Checker From ahrefs: If you have an enterprise-level site, or if you manage multiple websites, then ahrefs’ tools may be a good fit for you. Their Broken Link Checker is incredibly easy to use. You can start out with a 7-day trial for $7, but a subscription starts at $99 a month.

How Can 404 Errors Hurt Your Marketing?

Intuitive navigation is one of the core elements of an effective web design. That’s why a 404 error can be one of the most frustrating things your visitors can encounter. If a visitor can’t get to the content or page they are looking for, they are likely to leave your site altogether and go to a competitor’s site instead.

In addition to a poor user experience, having an excessive amount of 404 errors can hurt your site’s SEO efforts, causing you to appear less often in search results. How? Google takes notes of high bounce rates — a metric of people coming to your site but leaving quickly. People will leave your website if it’s poorly designed and if there are excess 404 errors.

Learn more about the website activity on your website:

The most common online errors (and how to fix them)

Use 404 Pages As A Branding Opportunity

While an error on your site is not ideal, you can turn a negative into a positive. Many companies get creative with their 404 pages. Just don’t forget to stick to your core color scheme — a 404 page is a great opportunity to showcase your brand’s personality and make an impression on visitors. You could even incorporate links to other helpful content and resources or a call to action to help get the visitor on their way.

The most common online errors (and how to fix them)

Still Need Help With Your 404s?

It’s inevitable: 404 errors will pop up on your site. However, it’s important to proactively and continuously monitor your site’s performance to check for these errors. It’s just as important as posting quality content on your website. Google likes websites that post content regularly — even as little as a couple times a month makes a difference! Taking the time to update your website and perform technical assessments will help you stay ahead of the curve and keep those industrial leads interested.

If you need some help, contact the team at Thomas. We’ve helped more than 5,000 industrial companies build and optimize their websites to reach B2B leads, and we’re here to help you, too. Ask us about our free digital health check to let you know how your website can improve and how it compares against competitors.

Whether you’re just getting started or you’ve been at this a while, the more you learn about data protection and what you should be doing to comply with the law, the more likely you are to notice when things don’t go to plan.

We’re here to help. That’s why we’ve put together some of the most common data protection mistakes that organisations tell us about on a daily basis – and how to fix them.

If you need more advice, you can get help and support from our dedicated team.

Sending an email to the wrong person

This is easy to do, especially if more than one person in your address book has the same name.

Tools like Autofill predict who you’re emailing when you start typing someone’s name in the ‘To’ field. It’s a quick way to go through your address book. But the few seconds you save by using Autofill could end up costing you a lot more if you send personal data to the wrong person by mistake.

Fix it

Act quickly. Try to recall the email as soon as possible. If you can’t recall it, contact the person who received it and ask them to delete it. In the future, consider turning off the Autofill tool when sending work emails.

The 72 hours following a personal data breach are particularly critical. We’ve set out the steps you need to follow in this handy guide on how to respond to a personal data breach.

Putting service messages in the same boat as marketing

Service messages aren’t the same as marketing messages. Service messages aim to keep people informed by providing important factual information, such as a warning about the safety of a product. Marketing messages, on the other hand, aim to promote a service, business or organisation.

Generally speaking, you should consider them separately. While you can’t always legally contact people for marketing purposes, you can contact them to tell them things they need to know as part of the service you’re providing, or that would help keep them safe.

Fix it

Try to think of data protection as a set of principles, rather than a definitive list of what you can and can’t do.

Make sure you know the rules around marketing messages before you collect and use people’s information in this way – whether that’s a product, a service or an idea. You also need to be careful not to combine service and marketing messages. Even if you put a service message at the end of a sales email, you’ll still need to follow the marketing rules.

Letting your ICO registration expire

If you have or use information about people, also known as processing, you may have to register with the ICO and pay a fee.

Data protection fees are due to be paid every year. If you need to pay – and don’t – you could be fined. Most small organisations will only need to pay £40 or £60 a year.

Fix it

Check if you need to pay. If you’ve already registered and paid, you’ll receive a certificate from the ICO which will include your renewal date. It’s a good idea to either set up a Direct Debit, or set a reminder one month before your annual fee is due so that you can pay it on time.

Opening unfamiliar web links or attachments

Occasionally, you may get emails from people you don’t know, or receive suspicious-looking links and attachments. Sometimes, these can be phishing emails or attempts at other types of cyber crime which can harm your computer and systems.

Fix it

  • suitable firewalls for all work devices;
  • storage systems that are fit for purpose; and that know how to spot suspicious emails before clicking on links or opening attachments.

For more information on how to secure your data, the NCSC has a suite of helpful resources.

Keeping things you don’t need, ‘just in case’

The more personal data you hold, the more storage space and security measures you need to keep it safe – which will cost you time, as well as money. For example, it’ll take you longer to deal with a request for information if you need to search through thousands of old documents, rather than a few hundred current ones. In addition, data protection legislation says that personal information shouldn’t be kept for longer than you need it.

Fix it

Have a reason to keep information, rather than a reason to get rid of it. If you’re required to keep information for a certain length of time, such as financial, medical or legal records, record your reasons in a retention policy. This is a document that sets out your approach to how you manage, store and delete records. You should sort through your data on regular basis and destroy personal data securely when you no longer need it.

Ignoring a subject access request (SAR) because you don’t know what it is, or it wasn’t emailed to you

In data protection law, people have a ‘right of access’ to their own personal information. This means they can request any personal information that you may hold about them, known as a subject access request (SAR).

SARs can be made verbally or in writing. They don’t have to be directed to a specific contact in your organisation, or made using particular language or with reference to data protection legislation. You can’t require people to make a request in writing or ask them to use a specific form. If you receive a verbal request, you can invite people to follow up in writing, only if they want to. Having a written record of a SAR can be helpful for both parties, particularly if they made their request over the phone and you need to clarify a few points. But whether or not you make a written note of their request or they follow up in writing, their verbal request still stands. For example, an employee could ask for their personal information during a disciplinary meeting – this would count as a SAR.

Fix it

Make sure you and your staff understand how to recognise a subject access request and what to do if you receive one. In brief, it’s a subject access request if a person asks for information you hold about them, and you need to supply them with a copy of their personal information within set timeframes.

Halo Infinite players have reported connection issues in the game’s Multiplayer mode. Here are the most common server issues and how to fix them.

The highly-anticipated Halo Infinite released on December 8 2021, but it has experienced some issues, with server problems a key one. Players have run into server connection issues when attempting to play Halo Infinite’s online multiplayer modes. Additionally, some players are encountering matchmaking issues in Halo Infinite’s Big Team Battle mode. While the game’s developer, 343 Industries, has confirmed it’s working on fixes for these issues as a priority, it’s unlikely they’ll be resolved before the end of 2021.

While Halo Infinite players may not see a permanent fix until next year, suggested fixes for connection issues are making the rounds online. Many Halo Infinite players reported receiving the “Connection lost: You have been disconnected from the local network” error message. The first go-to fix for connection issues is simple: restart the game. Re-establishing the connection with the servers can often resolve connection issues. Server maintenance is carried out periodically, so check the official Halo Twitter account to see if any downtime is scheduled, or if there are any known issues with Halo Infinite‘s servers going down, or problems with Xbox Live or Steam. This is recommended, as it can save players a lot of time trying to troubleshoot issues beyond their control. Restarting the game is currently the only known fix for the “No ping to our datacenters detected” error message.

The second go-to fix is of a similar vein: restart the console or PC. For some players, rebooting their device removed the connection error messages they were previously seeing. If playing on PC, players should check if their hardware meets the game’s recommended requirements, or at least the minimum requirements, which can be found on the game’s Steam page. Halo Infinite uses the newer DX12 API instead of DX11, with reported DirectX 12 compatibility issues on older processors. If restarting the console or PC doesn’t help, players can try restarting their internet modem and/or router. If playing on Xbox, players can check their network connection to see if any issues are identified. While there is no minimum internet speed requirement to play Halo Infinite, players experiencing high ping or frequently being disconnected mid-match should check their connection speed, or use a wired ethernet connection instead of Wi-Fi.

How To Fix Halo Infinite Matchmaking Issues On PC And Xbox

One of the most complained about issues is getting stuck on the “Other players loading” message. For players experiencing matchmaking issues, there are a couple of additional fixes to try, although restarting the console or PC reportedly does the trick. If Multiplayer won’t load, check the game is fully downloaded and all game files are fully validated. Halo Infinite‘s multiplayer requires a separate download to the Campaign, so this is worth double-checking. Steam users can try validating their game files by going to Properties > Verify Files for Halo Infinite in Steam. Similarly, players on console can try resetting the game’s cache, which will remove temporary files which may be corrupted; the next time the game launches, the cache folder will be recreated.

These simple fixes to Halo Infinite’s connection issues serve as a temporary solution until the game’s developers release a permanent fix, which is anticipated to arrive in early 2022. Each of the above fixes is relatively quick to try, so players can attempt them all without spending too much time troubleshooting. Hopefully, a resolution to these ongoing connection error issues will be released sooner rather than later, alongside much-needed Challenges and fixes to Halo Infinite‘s Battle Pass. In the meantime, players can give each of these quick fixes a try, and hopefully find a fix that works for them so they can continue enjoying everything Halo Infinite has to offer.

The most common online errors (and how to fix them)

HTTP status codes are the conversation between your web browser and the website’s server. In most cases, you as the user will not see the code generated unless there is an issue.

Error messages, or HTTP status codes, are displayed when an internet browser can’t reach a page that was requested by a user. These codes are categorised into five groups, numbered from 1XX to 5XX, each indicating a different problem or error.

What is a 5XX Error?

Error codes that fall into the 5XX range specify problems with the server.

When you visit a website, your browser issues a request to that website’s server. If there is an issue with the site’s server, a 5XX error code is often returned.

These errors occur when the server realises it has come across a problem or is unable to carry out a request. Clarification should be provided, explaining why the error has occurred and whether it is a permanent or temporary issue.

5XX error messages indicate server-side errors where your website’s server has been unsuccessful in performing a request, for whatever reason. Generally, this suggests that the problem does not lie with your website, internet connection or computer, and more often than not it can be safe to assume server maintenance is being carried out to solve the issue.

A Guide to HTTP 5XX Server Errors

There are a number of different 5XX server errors, numbered with their own response codes so that the problem can be identified. It is important to familiarise yourself with the varying 5XX status codes and their meanings. Some of the most common of these are listed below.

500 – Internal Server Error

Perhaps the most common message encountered, this indicates a generic server error that’s displayed when the server cannot determine the exact problem.

501 – Not Implemented

The server cannot distinguish the request made, or is unable to perform the request for whatever reason. This typically suggests future accessibility.

502 – Bad Gateway

This occurs when the server is operating as a gateway or proxy server and the upstream server returns an invalid response.

503 – Service Unavailable

This signifies that the server is unavailable at the present moment, usually due to maintenance or overloading. It is generally a temporary issue and the user should try again later.

504 – Gateway Timeout

Like the 502 status, the server was functioning as a gateway or proxy server. This error occurs when the upstream server fails to respond in a timely manner.

What do 5XX Errors Look Like?

A 5XX Error is an error generated by the server, not the website. They are visible in any operating system so you may see this type of error message when using a desktop computer, tablet or smartphone. Server errors are often displayed inside the internet browser window just as web pages appear.

3 Simple Steps to Clearing a 5XX Error

5XX Errors are server-side meaning the problem is not likely to lie within your internet connection or device. There will be an error with your website server.

In the unlikely event that there is an issue with something your end, there are a few simple steps you can take before seeking further help and advice.

1. Refresh your browser

The problem may only be temporary, reloading the page will often prove successful. You can do this by resubmitting the URL from the address bar, pressing F5 or Ctrl-R on your keyboard.

2. Remove cookies

Sometimes 5xx errors are due to the cookies related to the website, so deleting these and refreshing the browser can often solve the problem. To do this, enter your web browsers History and select Delete. To remove the cookies from some devices you may need to check the box next to Cookies before hitting delete. Refresh your page and check to see if the error code represents itself.

3. Contact your host/server

If the problem continues, the best step is to contact your host or server directly to find out what the problem is. Chances are they are already on top of it or undergoing maintenance, but this will help put your mind at ease and give an idea of when it may be up and running again.

It is important not to ignore 5XX error messages when they appear. Not only do they have an adverse effect on the user’s experience but they aren’t bot-friendly either. Search engine robots like well-maintained websites so it’s important to investigate and fix site errors as you discover them.

For more information on our business hosting and IT support services, please contact a member of our technical team and discover how Blue Frontier can support you.

The most common online errors (and how to fix them)

Hayley Clasby

Hayley joined the Digital Marketing team at Blue Frontier in June 2018. Having previously worked with both online and offline marketing methods, she enjoys writing content and is now developing her knowledge and skills in SEO to help increase online visibility for businesses.

Coming up with a brilliant software solution takes lots of testing and tweaking. Throughout this process, you’re bound to come across error messages and other development roadblocks. When you know the different types of software bugs you’re likely to encounter, you’ll also know the best approaches to fixing them.

Keep reading to learn about common bugs you may have to deal with in the software development process.

1. Functional errors

This is a broad type of error that happens whenever software doesn’t behave as intended. For example, if the end user clicks the “Save” button, but their entered data isn’t saved, this is a functional error. After some investigation, a software tester may identify a more specific culprit behind the error and reclassify it as a different type of bug.

2. Syntax errors

A syntax error occurs in the source code of a program and prevents the program from being properly compiled. This type of error is very common and typically occurs when there are one or more missing or incorrect characters in the code. For example, a single missing bracket could cause a syntax error.

Compiling programs typically indicate where a syntax error has occurred so the programmer can fix it.

3. Logic errors

A logic error represents a mistake in the software flow and causes the software to behave incorrectly. This type of error can cause the program to produce an incorrect output, or even hang or crash. Unlike syntax errors, logic errors will not prevent a program from compiling.

A common logic error is the infinite loop. Due to poorly written code, the program repeats a sequence endlessly until it crashes or halts due to external intervention, such as the user closing a browser window or turning the power off.

Just so you know

Track and process software bugs online with Jotform’s free Issue Tracker Template.

4. Calculation errors

Anytime software returns an incorrect value — whether it’s one the end user sees or one that’s passed to another program — that’s a calculation error. This could happen for several reasons:

  • The software is using the wrong algorithm to calculate the value.
  • The calculation has a data type mismatch.
  • The developers have coded the calculation or value hand-off to another program incorrectly.

While such an error can be costly in certain contexts — like in banking, where an incorrect calculation can result in the loss of money — hunting down the calculation error is typically just a matter of math.

5. Unit-level bugs

David LaVine, founder of RocLogic Marketing and a former engineer, says unit-level software bugs are the most common. They’re also typically the easiest to fix.

After your software is initially coded, you need to see how it works through unit testing — taking a small, logical section of code and verifying that it performs as designed. This is where various forms of state machine bugs, calculation errors, and basic logic bugs are often uncovered.

“The bugs are relatively easy to isolate when you’re dealing with a small amount of code that’s within your control,” LaVine says. “They’re also relatively easy to replicate because there aren’t a lot of complex, asynchronous interactions taking place yet.”

6. System-level integration bugs

This type of bug occurs when two or more pieces of software from separate subsystems interact erroneously. Often the two sets of code are written by different developers. LaVine explains that even when there’s a solid set of requirements for developers to follow, there’s usually some level of interpretation required or details that get overlooked, causing the interaction between two pieces of software to fail.

“System-level integration bugs are harder to fix because you’re dealing with more than one piece of software, so the complexity increases while overall visibility decreases,” LaVine says. “This class of bug is often caused by things like byte-swapping, message parsing, or memory overflow issues.”

7. Out of bounds bugs

LaVine notes that these types of software bugs show up when the end user interacts with the software in ways that weren’t expected. This often occurs when the user sets a parameter outside the limits of intended use, such as entering a significantly larger or smaller number than coded for or inputting an unexpected data type, like text where a number should be.

“In some cases, the user may cause the solution to perform more calculations than it’s been developed to handle,” LaVine says.

Below are Optik TV’s most common error codes and simple tricks for fixing them. While error codes may occasionally come up, they should not be commonplace.

Error message


Optik TV is initializing

At this time, the digital box is attempting to connect back to our TV center. If the screen is seen longer than 15 minutes, please follow My TV is initializing.

Recording list is unavailable

When your digital box and PVR become out of sync, recordings will be unavailable. This error can also occur on the PVR when it did not boot properly. To resolve, simply reboot your PVR and allow it a few moments after it has tuned to a Live TV channel for the recordings to be available again.

Your digital box has gone into Standby Mode after 4 hours of inactivity. Pressing “OK” on your remote will bring Live TV back.

Your television cannot support hdcp video over your high definition connection

When connections are attempted between your TV, your video cable and your digital box they can sometimes fail resulting in this error message. These errors can be random and sometimes more frequent but can often be resolved with a few simple troubleshooting steps. For more information, refer to HDMI troubleshooting.

This error can come up in different situations. The most common one is seen within applications (e.g. Netflix, YouTube) or in our Video On Demand storefront.

“Something unexpected happened. Please try again later (LP1008).” This error is due to a backend account linkage issue.

To troubleshoot this issue, please make sure you:

1) Have a My TELUS account and have completed registration

2) Are subscribed to TV services if you are trying to access the Optik App/Pik App.

HD PVR is offline

Recording capabilities may have been disabled. Contact us and we will re-enable them for you.

PVR is starting, please wait.

After rebooting the PVR, it can take a few moments to be ready. The amount of time it takes depends on how many recordings there are.

Simply allow the PVR a few moments and it will be ready on its own.

Account unavailable / client has been disabled / quit client

There may be a problem on our end. Please contact us for assistance.

Please enter a registration / activation code

Digital box should register automatically after a few moments if you acquired the digital box directly from TELUS. Otherwise, contact us and we will provide you with a registration code

The application you have tried to access is temporarily unavailable

Please allow a few moments and try again. If the issue persists, a reboot of the affected digital box may be required.

Arris problem detected

The word “Arris” and a loading bar will pop up on your TV screen. A reboot of the digital box will normally solve the issue.

The most common online errors (and how to fix them)

A hot tub flow error indicates that there is a problem with the flowing of water through the hot tub heater. Some of the most common hot tub error codes are FLO, FL1 or FL2, and are picked up by flow or pressure switches. The most common causes for this are a dirty or damaged filter, low water levels, air in the pipework or a faulty pump or sensor..

What are hot tub flow switches?

Hot tub flow switches and pressure switches monitor the flow of water through your tub and act as a safety device, turning the heater off if the water flow is interrupted. This safety mechanism is built into hot tubs to prevent damage to your heater and other equipment.

We’ve put together this troubleshooting guide to help you diagnose and fix your hot tub water flow issues without the need for a hot tub technician.

What is the difference between flow error codes?

The exact error code you will see may vary between manufacturer and model. You should always consult the manufacturers instruction booklet for specific information, however generally it is found that:

  • FL1 hot tub code – indicates that there is an error with the flow switch and it is stuck in the open position
  • FL2 hot tub code – indicates that there is an error with the flow switch and it is stuck in the closed position
  • Flo hot tub code – indicates there is an issue with the water flow

Hot Tub Flow Error Troubleshooting Checklist

There are several checks you can perform to try and resolve your hot tub flo errors including:

1. Does the water ‘kiss the pillows’?

The hot tub water line should be touching the bottom of the pillows when no one is in the spa. If your hot tub does not have pillows, then it will have a ‘waterline’ indicator somewhere on the shell or the filtration skimmer. Ensure that your hot tub water line meets the minimum requirements and top up if necessary.

2. When did you last clean the filter?

If your filter is dirty it could be restricting the flow of water around the hot tub. Every 10 weeks you should clean and soak your hot tub filters overnight. Whereas, on a weekly basis, you should always try and ‘rinse’ the large debris out of your filter.

For more information, take a look at our hot tub filter cleaning guide.

3. When did you last get a new filter?

Your hot tub filter may be clean, but with every use, the fibres break down restricting the flow of water.

Hot tub filters should be replaced every 12-18 months and we recommend always having two filters so you can rotate them during cleaning. It is also important to purchase genuine hot tub filters to ensure that your tub runs more efficiently as this will give you a better circulation of water.

4. Have you recently refilled/changed the spa water?

If you recently filled the spa, where did you put the hose during filling? When refilling a hot tub, you need to put the hose pipe down the filter housing so that the water fills the internal pipework first. If you simply ‘drop’ the hose into the main spa area it may have been backfilled – causing airlock. Make sure the water is at the required water line before you turn the hot tub on.

What is a hot tub airlock?

An airlock is a large pocket of air trapped within the pipes of your hot tub. It will reduce the circulation of water as it will not properly flow through the hot tub heater.

5. Are all the jets/air controls switched on and are all diverters in their central position?

Closing off these controllers can prevent the flow needed for filtration and therefore cause a problem. Ensure that these are open along with the jets in all seats.

How to fix hot tub flow errors

The following solutions are recommended to try and resolve your hot tub flow errors:

Solution A: Increase the hot tub water level

If the water level is not correct, top up your tub with more water. Switch off the power and remove the filters. After 20 minutes, switch the power back on and run the spa/jets without the filters to see if it clears the flow issue.

If the flow clears, switch off the power again, replace the filter and then switch on the power. Then, if the flow issue returns you know the issue is with the filter and it will need replacing.

Solution B: Remove an airlock in your hot tub heater

As a first step we recommend the following actions to remove an airlock in your hot tub:

  1. Make sure all jets are open
  2. Run the spa pumps without filters and see if it clears

If this does not work try the following:

  1. Switch the spa off
  2. Run a hose pipe to your hot tub, ensuring you place the pipe down the filter housing to try and push the air through

If the flow issue does not clear after solution A or B then it is possible you either have a faulty pump that is not pushing the water through or a faulty pressure/flow switch. If this is the case, we recommend calling a technician to help solve your hot tub problem.

Alternatively, talk to our team of experts and book a hot tub service here.

You as a sysadmin know that for sure – printer errors, hard drive errors, battery errors, and system errors.

Here you’ll find a list of the most common HP errors and proven quick fix solutions:

And you’ll find the solution to get rid of ALL HP errors – forever: Test PRTG as your new monitoring tool and get stared within minutes!

1. HP error:

“Printer in Error State”

Quick fix

This HP printer error is a common error when sending a document for printing. The error message indicates that the printer is either turned off, not properly connected to your computer or missing an internet connection. Another possible reason for the general error state is that your HP printer is running low on paper or ink.

To fix the error, try the following steps:

  • Make sure the printer is turned on. You can also restart both the printer and your computer.
  • Check if the printer is connected to your computer or WI-FI network.
  • Make sure the paper try of your printer is loaded and that the printer has enough ink.
  • If the error still occurs, contact the HP printer support.

Proper fix

Switch to PRTG: Monitoring software PRTG monitors all the SNMP-compatible HP devices in your network: HP computers, printers, switches, routers, and more.

Find out how PRTG’s HP monitoring can help you get rid of HP Errors:

2. HP error:

“Error 59.F0”

Quick fix

The HP printer error 59.F0 indicates that there is a problem with the internal motor of your HP printer. The most common cause of the problem is the failure in transfer alienation, meaning that the ITB is stuck and unable to rotate. The error 59.f0 can also be caused by a problem of the SR9 sensor.

To solve the issue, reset the printer settings and remove the surge protector. If this does not solve the problem, reset the ITB and check its internal connections. If the ITB is damaged, you may have to replace it in order to get rid of the HP error.

Proper fix

Switch to PRTG: Monitoring software PRTG monitors all the SNMP-compatible HP devices in your network: HP computers, printers, switches, routers, and more.

Find out how PRTG’s HP monitoring can help you get rid of HP Errors:

3. HP error:

“3F0 Error” or “Boot Device Not Found”

Quick fix

The HP hard drive error 3F0 may occur when the system boot process is not supported by the hard disk. The cause can be a hard drive connection issue, an incorrect boot sequence in the Basic Input-Output System (BIOS), a malware attack, or a damaged hard drive.

If you are facing HP error 3F0 and the boot device is not, solve the problem by following these simple steps:

  1. Hard Reset: By performing a hard reset, you can erase all information in the computer memory. This forces the system to reestablish the connection between the hard drive and the BIOS.
  2. BIOS Settings: Another possible solution is to restore the BIOS default settings in the BIOS Setup section. After the reset, restart your computer and check if the error still occurs.
  3. Hard Drive Test: Use HP PC Hardware Diagnostics to run either a quick test or an extensive test, and review the error log afterwards.
  4. Hard Drive Reseat: If the first steps did not solve HP error 3F0, check if your hard drive is damaged or needs to be reseated.

Proper fix

Switch to PRTG: Monitoring software PRTG monitors all the SNMP-compatible HP devices in your network: HP computers, printers, switches, routers, and more.

Find out how PRTG’s HP monitoring can help you get rid of HP Errors:

4. HP error

“Error 79”

Quick fix

The HP printer error 79 usually occurs when a print job is either corrupted or when the connection between the HP printer and the print spooler is not working.

To solve HP error 79, make sure that your firmware is up to date and that the connection between printer and software is working properly. If this does not help, remove all print jobs from the computers that have access to the printer. Then remove your HP printer from the list of devices in your network. Reestablish the connection and try again.

Proper fix

Switch to PRTG: Monitoring software PRTG monitors all the SNMP-compatible HP devices in your network: HP computers, printers, switches, routers, and more.

Find out how PRTG’s HP monitoring can help you get rid of HP Errors:

5. HP error

“Error 49” or “Error 49.4 C02”

Quick fix

The listener received a request to set up a connection to a database or other service. The connect descriptor that has been received by the listener specified a service name for a service (usually a database service). Either it has not been dynamically registered with the listener yet or has not been configured statically for the listener. This can be a temporary condition, for example, after the listener has been started, but before the database instance has registered with the listener.


  • Wait a moment and try to reconnect.
  • Find out which services are currently known by the listener by executing: lsnrctl services
  • Dopple-check that the SERVICE_NAME parameter in the connect descriptor of the net service name used specifies a service known to the listener.
  • If an easy connect naming connect identifier was used, prove that the service name specified is a service known to the listener.
  • Check in the listener.log file for an event.

Best solution:

Proper fix

Switch to PRTG: Monitoring software PRTG monitors all the SNMP-compatible HP devices in your network: HP computers, printers, switches, routers, and more.

This article lists and explains the most common AnyDesk errors and status messages that may occur.

Error Messages

This error code is generated by Windows and displayed by AnyDesk. In almost every case this error occurs due to an improperly configured firewall. Please see Disconnecting Sessions.

Status Messages

Could not log in to the remote computer. AnyDesk’s window must be open on the remote computer in order to connect. Interactive Access must be configured on the remote computer to always show a connection request.
The session was interrupted on the remote side. Please wait while AnyDesk is trying to restore the session. Connection reset after some time due to improperly configured firewall. Please see Disconnecting Sessions.
The network connection was closed unexpectedly. Connection reset after some time due to improperly configured firewall. Please see Disconnecting Sessions.
The Session was denied due to the access control settings of the remote computer. Your ID is not whitelisted in the ACL (Access Control List) of the remote client.
Your license does not allow more sessions. Please close other sessions or contact sales to obtain an upgrade. This message is displayed in case the session limit of your license has been reached.
In some rare cases sessions are not terminated and still run in the background.
If that is the case, you can terminate the session in your customer portal on
The session has ended. Status: desk_rt_27 This message is displayed if the session has been automatically disconnected due to inactivity.
This message is only displayed if the remote device is using AnyDesk 6.1.0 for Windows or newer and the connecting device is not using AnyDesk 6.1.0 for Windows or newer.

Messages while connected

Please wait for the remote user to accept the UAC dialog. The remote side gets displayed a Windows UAC dialog and has to either enter administrator credentials or cancel the UAC request.
Too many rejected connection attempts. Please try again later. After several session requests have been rejected by the remote side no additional requests are possible for some time.
Logging on to the remote computer is blocked by the AnyDesk settings. The remote side is configured to not allow incoming connections.
Remote display server is not supported (e.g. Wayland) This message will be displayed in case the remote side uses Linux and any other display server as X11. In most cases you can change the display server on the login screen while the user is logged out of the session (this varies slightly between distributions)

Fatal Error

The most common online errors (and how to fix them)

If a fatal error, from which AnyDesk cannot recover, occurs, a crash dialog is displayed.
It contains technical information that helps identifying issues.

The “Send” button submits the crash information, including the devices IP-address, to our servers, helping us locate and fix the issue.
To provide us with further information, send a copy of the crash report, including crash-ID and a detailed report of the actions preceding the crash, to our support team.

Exit Codes

Documentation of exit code values for third parties wishing to use AnyDesk from scripts or other programs.

The most common online errors (and how to fix them)

Prices, specifications, availability and terms of offers may change without notice. Price protection, price matching or price guarantees do not apply to Intra-day, Daily Deals or limited-time promotions. Quantity limits may apply to orders, including orders for discounted and promotional items. Despite our best efforts, a small number of items may contain pricing, typography, or photography errors. Correct prices and promotions are validated at the time your order is placed. These terms apply only to products sold by; reseller offers may vary. Items sold by are not for immediate resale. Orders that do not comply with terms, conditions, and limitations may be cancelled. Contract and volume customers not eligible.

HP’s MSRP is subject to discount. HP’s MSRP price is shown as either a stand-alone price or as a strike-through price with a discounted or promotional price also listed. Discounted or promotional pricing is indicated by the presence of an additional higher MSRP strike-through price

The following applies to HP systems with Intel 6th Gen and other future-generation processors on systems shipping with Windows 7, Windows 8, Windows 8.1 or Windows 10 Pro systems downgraded to Windows 7 Professional, Windows 8 Pro, or Windows 8.1: This version of Windows running with the processor or chipsets used in this system has limited support from Microsoft. For more information about Microsoft’s support, please see Microsoft’s Support Lifecycle FAQ at

Ultrabook, Celeron, Celeron Inside, Core Inside, Intel, Intel Logo, Intel Atom, Intel Atom Inside, Intel Core, Intel Inside, Intel Inside Logo, Intel vPro, Itanium, Itanium Inside, Pentium, Pentium Inside, vPro Inside, Xeon, Xeon Phi, Xeon Inside, and Intel Optane are trademarks of Intel Corporation or its subsidiaries in the U.S. and/or other countries.

In-home warranty is available only on select customizable HP desktop PCs. Need for in-home service is determined by HP support representative. Customer may be required to run system self-test programs or correct reported faults by following advice given over phone. On-site services provided only if issue can’t be corrected remotely. Service not available holidays and weekends.

HP will transfer your name and address information, IP address, products ordered and associated costs and other personal information related to processing your application to Bill Me Later®. Bill Me Later will use that data under its privacy policy.

Microsoft Windows 10: Not all features are available in all editions or versions of Windows 10. Systems may require upgraded and/or separately purchased hardware, drivers, software or BIOS update to take full advantage of Windows 10 functionality. Windows 10 is automatically updated, which is always enabled. ISP fees may apply and additional requirements may apply over time for updates. See

HP Rewards qualifying and eligible products/purchases are defined as those from the following categories: Printers, Business PCs (Elite, Pro and Workstation brands), select Business Accessories and select Ink, Toner & Paper.

Hearing aids are the most common treatment for hearing loss. Millions of individuals wear these miniature, custom-fit, digitally programmed and personalized hearing solutions every day. If you rely on hearing aids to keep you hearing clearly at all times, you know how important it is to quickly identify and troubleshoot problems.

The most common online errors (and how to fix them)Our basic troubleshooting
tips can help you fix many
common hearing aid issues.

Common hearing aid issues

The four most common issues hearing aid wearers experience are:

  • My hearing aids aren’t producing any sound (or my hearing aids are “dead”)
  • My hearing aids aren’t loud enough
  • My hearing aids sound “funny” or distorted
  • My hearing aids are “whistling” or producing feedback

Troubleshooting steps for these common issues are highlighted below and in our downloadable guide. We ordered the checklists with the simplest fixes at the top. If you’re not able to fix your hearing aids yourself, you may need to see a hearing care professional to find out what to do to get your hearing aids repaired.

My hearing aids aren’t producing any sound

  1. Visually examine the hearing aid. Is there earwax blocking the microphone opening or sound outlet? Carefully clean away any debris.
  2. Make sure your hearing aid is turned on. Hearing aids are usually powered on by closing the battery door. If the battery door won’t shut easily, the battery is likely upside down. Take the battery out, flip it and try inserting again. If placed properly, the door will close easily.
  3. Turn up the volume with your remote control or directly on the hearing aid. If you have a manual volume control wheel, adjust the wheel up and down a couple of times to make sure it’s all the way on.
  4. Toggle between the programs or memories. If you have a button to change settings, press it and listen for several minutes to see if that makes a difference.
  5. Replace the battery. If you have a hearing aid battery tester, check the voltage of the old battery to confirm it’s dead before activating a new battery by removing the sticker.
  6. Consider whether the hearing aid may be damaged. Contact your hearing care professional for further assistance. They may have walk-in hours or same-day appointments for troubleshooting and hearing aid repair.

My hearing aids aren’t loud enough

  1. Visually examine the hearing aids. Is there earwax blocking the microphone opening or the sound outlet? If you wear a behind-the-ear (BTE) hearing aid with an earmold and tubing, inspect the tubing to make sure there are no cracks, blockages or beads of moisture. Contact your hearing center if you need assistance replacing the tubing. They may have walk-in hours or same-day appointments for troubleshooting and repair.
  2. Turn up the volume with your remote control or directly on the hearing aid. If you have a manual volume control wheel, adjust the wheel up and down a couple of times to make sure you can hear the volume changing.
  3. Try a different program or memory. You may have accidentally switched to a different program that is set differently to your usual program.
  4. Consider whether your hearing may have changed. If it’s been a while since your last hearing evaluation, you may need to schedule a hearing test with your hearing care professional. They may be able to adjust your hearing aids to accommodate any changes to your hearing ability.

My hearing aids sound “funny” or distorted

  1. Visually examine the batteries. Are they corroded? If so, replace them.
  2. Inspect the battery contacts. These are the little metal prongs that connect with the battery when the door is closed. Are they corroded? If so, open and close the battery compartment several times to clean the contacts. Then replace the battery and see if the sound has improved. Your hearing care professional can also clean the battery contacts for you. Do they appear to make contact with the battery? If they are oriented correctly to make contact, you are likely to see scratches on the surface of a used battery.
  3. Try a different program or memory. You may have accidentally switched to a wireless setting meant to be used with an assistive listening device.
  4. Consider whether the hearing aids may be damaged. Contact your hearing care professional for further assistance. They may have walk-in hours or same-day appointments for troubleshooting and hearing aid repair.

My hearing aids are “whistling” or producing feedback

  1. If your hearing aids are whistling while in your ears, remove them and try re-inserting them. They may not be inserted properly.
  2. Turn down the volume. If the hearing aids are properly inserted and they stop whistling when you turn down the volume, there may be too much sound leaking out through the vent or around the earmold. You may need to have the fit adjusted by your hearing care professional.
  3. If you think your ear canals may be blocked with earwax, see your hearing care professional or physician to have your ears cleaned thoroughly. This blockage could be causing feedback in two different ways:
    —You turn up the volume higher than normal so you can hear through the earwax, leaking out more sound than usual, or
    —Sound can bounce off any blockage in your ear canal and leak back out.
  4. If you have recently lost a considerable amount of weight, the fit of your hearing aids may have changed. Your hearing care professional can evaluate the new fit and determine whether they can fix the issue in the office or if you need to have your hearing aids or earmolds remade.

If you’ve tried these troubleshooting tips and your hearing aids still aren’t working, see a hearing healthcare professional for assistance. They may be able to fix the issue in the office on the same day. If one or both of your hearing aids need factory repairs, your hearing professional can take care of that for you as well.

Have trouble remembering these? View and print our full troubleshooting hearing aid issues checklist!

Mandy Mroz , AuD , President , Healthy Hearing

The most common online errors (and how to fix them)Dr. Mandy Mroz earned her doctorate in audiology from the University of Florida. Mandy’s career is guided by her dedication to serving people with hearing loss and her past experience in hearing research, training and management. Read more about Mandy.

Literature reviews are an integral part of the process and communication of scientific research. Whilst systematic reviews have become regarded as the highest standard of evidence synthesis, many literature reviews fall short of these standards and may end up presenting biased or incorrect conclusions. In this post, Neal Haddaway highlights 8 common problems with literature review methods, provides examples for each and provides practical solutions for ways to mitigate them.

Researchers regularly review the literature – it’s an integral part of day-to-day research: finding relevant research, reading and digesting the main findings, summarising across papers, and making conclusions about the evidence base as a whole. However, there is a fundamental difference between brief, narrative approaches to summarising a selection of studies and attempting to reliably and comprehensively summarise an evidence base to support decision-making in policy and practice.

So-called ‘evidence-informed decision-making’ (EIDM) relies on rigorous systematic approaches to synthesising the evidence. Systematic review has become the highest standard of evidence synthesis and is well established in the pipeline from research to practice in the field of health. Systematic reviews must include a suite of specifically designed methods for the conduct and reporting of all synthesis activities (planning, searching, screening, appraising, extracting data, qualitative/quantitative/mixed methods synthesis, writing; e.g. see the Cochrane Handbook). The method has been widely adapted into other fields, including environment (the Collaboration for Environmental Evidence) and social policy (the Campbell Collaboration).

The most common online errors (and how to fix them)

Despite the growing interest in systematic reviews, traditional approaches to reviewing the literature continue to persist in contemporary publications across disciplines. These reviews, some of which are incorrectly referred to as ‘systematic’ reviews, may be susceptible to bias and as a result, may end up providing incorrect conclusions. This is of particular concern when reviews address key policy- and practice- relevant questions, such as the ongoing COVID-19 pandemic or climate change.

These limitations with traditional literature review approaches could be improved relatively easily with a few key procedures; some of them not prohibitively costly in terms of skill, time or resources.

In our recent paper in Nature Ecology and Evolution, we highlight 8 common problems with traditional literature review methods, provide examples for each from the field of environmental management and ecology, and provide practical solutions for ways to mitigate them.

Problem Solution
Lack of relevance – limited stakeholder engagement can produce a review that is of limited practical use to decision-makers Stakeholders can be identified, mapped and contacted for feedback and inclusion without the need for extensive budgets – check out best-practice guidance
Mission creep – reviews that don’t publish their methods in an a priori protocol can suffer from shifting goals and inclusion criteria Carefully design and publish an a priori protocol that outlines planned methods for searching, screening, data extraction, critical appraisal and synthesis in detail. Make use of existing organisations to support you (e.g. the Collaboration for Environmental Evidence).
A lack of transparency/replicability in the review methods may mean that the review cannot be replicated – a central tenet of the scientific method! Be explicit, and make use of high-quality guidance and standards for review conduct (e.g. CEE Guidance) and reporting (PRISMA or ROSES)
Selection bias (where included studies are not representative of the evidence base) and a lack of comprehensiveness (an inappropriate search method) can mean that reviews end up with the wrong evidence for the question at hand Carefully design a search strategy with an info specialist; trial the search strategy (against a benchmark list); use multiple bibliographic databases/languages/sources of grey literature; publish search methods in an a priori protocol for peer-review
The exclusion of grey literature and failure to test for evidence of publication bias can result in incorrect or misleading conclusions Include attempts to find grey literature, including both ‘file-drawer’ (unpublished academic) research and organisational reports. Test for possible evidence of publication bias.
Traditional reviews often lack appropriate critical appraisal of included study validity, treating all evidence as equally valid – we know some research is more valid and we need to account for this in the synthesis. Carefully plan and trial a critical appraisal tool before starting the process in full, learning from existing robust critical appraisal tools.
Inappropriate synthesis (e.g. using vote-counting and inappropriate statistics) can negate all of the preceding systematic effort. Vote-counting (tallying studies based on their statistical significance) ignores study validity and magnitude of effect sizes. Select the synthesis method carefully based on the data analysed. Vote-counting should never be used instead of meta-analysis. Formal methods for narrative synthesis should be used to summarise and describe the evidence base.

There is a lack of awareness and appreciation of the methods needed to ensure systematic reviews are as free from bias and as reliable as possible: demonstrated by recent, flawed, high-profile reviews. We call on review authors to conduct more rigorous reviews, on editors and peer-reviewers to gate-keep more strictly, and the community of methodologists to better support the broader research community. Only by working together can we build and maintain a strong system of rigorous, evidence-informed decision-making in conservation and environmental management.

Note: This article gives the views of the authors, and not the position of the LSE Impact Blog, nor of the London School of Economics. Please review our comments policy if you have any concerns on posting a comment below

Working from home may sound a like luxury but without a stable and reliable broadband connection, it may turn into a nightmare. If your WiFi doesn’t work as expected, it can hamper your work greatly. You will face troubles like low-quality video calls, prolonged download times and other communication issues. So, to create a robust wireless network at home, you need to know the common WiFi issues and their ideal solutions.

Let’s take look at them –

WiFi connection failure

You have switched on your router and keyed in the SSID and password correctly in your smartphone or laptop. Then, you have also changed the settings to automatically connect to this network. But you still fail to establish the connection.

  1. Cause: Wi-Fi range issues or interference can lead to troubles in connectivity. Sometimes it is simply due to some minor technical glitches.
  2. Solution: If your WiFi connection failed, choose the “forget network” option in your device. Discover the Wi-Fi again and re-enter the credentials and try connecting.

Internet stops working suddenly

Your Wi-Fi signal seems to be working fine, but when you try to connect to the network you notice that the internet connection has stopped working.

  1. Cause: Internet issues in the router could cause such troubles. This might be indicated by the Internet LED on the router turning off or turning red, depending on the device you own. Your router might be assigned a dynamic IP address. If the network is overloaded or the router efficiency drops due to some reason, it might miss the communication of new IP address, which can lead to internet failures.
  2. Solution: Restarting the router will allow it to look for its newly assigned IP address. If the problem occurred due to a crowded network, taking this step should solve it.

WiFi drop out issue

When you are playing a competitive online game, losing the internet connection for even a second can be really frustrating. In such a case, check whether the latency is high in your network. Many speed test apps display the latency in milliseconds. If the latency value of the connection is more than 30ms, then you might experience occasional drops in the Wi-Fi signal.

Connect now to get the best of broadband plans and get additional offers on:

  1. Cause: Network congestion could be one of the major causes of timeouts in connection and latency issues.
  2. Solution: Download a Wi-Fi analyzer app on your smartphone and identify the ideal channels for your connection. Most routers choose the channel for connection automatically. But if you are located in a crowded residential area where there are plenty of wireless networks in proximity, you might also benefit from manually choosing the channel. After choosing the channel width and the channel number, run a speed test again and check for any improvement.

Performance issues on some devices

It so happens that some of the computers connected in the network work without trouble, but streaming becomes close to impossible in other devices. If you have ruled out other problems like network congestion, you can check the Wi-Fi mode settings for a better picture.

  1. Cause: By default, routers come with a mixed 802.11 mode setting. If you had changed this to 802.11n only, it could lead to performance issues on some devices.
  2. Solution: Choose the mixed-mode setting so that devices with different generations of Wi-Fi adapters can continue to enjoy a resilient connection to the router.

With these easy WiFi troubleshooting tips, you can work from home comfortably, and enjoy your favorite movies and games without any hassle. When your Wi-Fi connection is stable, you can experience the maximum benefits of your broadband plan.