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How to Solve 502 Bad Gateway Issues?

If you browse the internet long enough, you’ll run into a 502 Bad Gateway error code. This is especially true if you frequently visit websites known to be unreliable. While the error can be frustrating, the good news is that it’s usually easy to fix.

In this article, we’ll take a look at what a 502 Bad Gateway error code is and how you can go about solving it on your own.

What does 502 Bad Gateway mean?

A 502 Bad Gateway indicates that the edge server (server acting as a proxy) could not get a valid or any response from the origin server (also called the upstream server). This can occur for a few reasons, which we’ll discuss below. If one of KeyCDN’s edge servers receives a 502 Bad Gateway response from your origin server, KeyCDN will return a 500 Origin Not Reachable page.

To better understand how KeyCDN handles certain error codes, check out our CDN Error Codes page.

Usually, a 502 Bad Gateway error code is accompanied by a message letting you know that a «bad gateway» exists. In other words, something went wrong while the server was trying to relay information to another server (usually an upstream server). The most common cause of this issue is an incorrect or outdated DNS record.

What are the reasons for 502 Bad Gateway responses?

Three main culprits cause 502 Bad Gateway responses. These include:

  1. Domain name not resolvable: The domain name is not resolving to the correct IP or it does not resolve to any IP. It is important to note that DNS changes could take same time until they are global fully propagated and active. This is dependent on the TTL, or time to live, defined per record.
  2. Origin server down: The server is not reachable, either because it is down or there is no connectivity to the server given.
  3. Firewall blocks request: A firewall blocks the communication between the edge servers and the origin server. This can also be caused by security plugins of your CMS. Some DDoS protection and mitigation systems might are too overreactive and start blocking requests from our content delivery servers.

How you might see a 502 Bad Gateway error

Based on your web server, you might see a different 502 error.

Every time, it means the same thing. The only different component is their naming conventions. Here are a few examples of what you might see:

  • 502 Bad Gateway
  • HTTP Error 502 — Bad Gateway
  • 502 Service Temporarily Overloaded
  • Error 502
  • 502 Proxy Error
  • HTTP 502
  • 502 Bad Gateway NGINX

You can see in greater detail what the error specifically entails by going to your web server’s error log file. All error and diagnostic information is stored in this file making it a valuable resource to check when you need more details about a particular error. You can locate this file in Apache by going to /var/log/apache2/error.log and in Nginx by going to /var/log/nginx/error.log .

You can see what the error specifically entails by going to your web server’s error log file in greater detail. All error and diagnostic information are stored in this file, making it a valuable resource to check when you need more details about a particular error. You can locate this file in Apache by going to /var/log/apache2/error.log and in Nginx by going to /var/log/nginx/error.log .

How to solve 502 errors as a web developer

As a web developer or owner of the website, there are a few reasons why you may be experiencing a 502 Bad Gateway error on your origin server. Therefore, you may need to try various methods to resolve the issue. Reference the list of suggestions below:

  • Check if your FQDN (fully qualified domain name) is resolving correctly by using our DNS test tool.
  • Verify if your server is reachable by using a ping test or traceroute.
  • Check your firewall logs if you are seeing unusual drops.
  • If you’re a Cloudflare user, try disabling it as once you’ve reached a certain limit Cloudflare will return a 502 Bad Gateway error to your visitors.

How to solve 502 errors as a visitor

If you’re a website visitor and experience a 502 Bad Gateway error then there is also a few things you can try to resolve it. Although the primary issue will almost always be the responsibility of the web developer, visitors can try the following:

  • Perform a hard refresh in your browser. On Macs, this is done by pressing Cmd + Shift + R .
  • Clear your browser cache and delete cookies. Your browser may be holding on to certain files that were saved once you visited the website with a 502 error.
  • Restart your computer/networking equipment
  • Change your DNS servers. If you’ve never changed them in the past you likely still have the default servers assigned to you by your ISP, try using open DNS servers such as Google’s Public DNS.

Common solutions for 502 Bad Gateway Error Code

Usually, a 502 error code is the result of a server error. A server error means that the server you are trying to access is unavailable or down. However, it is also possible on the client-side.

Here are some common ways to fix it in detail:

Reload the page

The first and easiest thing you can do is simply reload the page. A 502 error code and a 504 error code are both server-side errors. This means that there is something wrong with the server. The problem could be anything from the server being down to the server being too busy.

A reload will send a new request to the server. The server may be down, but it could also be that the original request timed out. A reload will often fix the problem.

Tools like DownForEveryoneOrJustMe are useful for seeing whether this is a server-side issue or an issue on your end.

Clear your browser’s cache

It is also possible that your browser’s cache is causing the problem. If you have recently visited the site, your browser may be trying to use an old version of the website. To clear your browser’s cache, go to the settings in your browser and look for the option to clear your cache.

In Google Chrome, you can go to the three dots in the top right corner and click More tools. From there, click Clear browsing data.

In Mozilla Firefox, you can go to the three bars in the top right corner and click Options. From there, click Privacy & Security and scroll down to Cookies and Site Data. Click Clear Data.

In Microsoft Edge, you can click the three dots in the top right corner and click Settings. From there, click Choose what to clear under Clear browsing data.

In Safari, you can click the Safari menu and click Preferences. From there, click the Privacy tab and click Manage Website Data. Click Remove All.

Restart your computer and router

It is also possible that the problem is on your end. If you have recently installed new software or made changes to your computer, these could be causing the problem. Try restarting your computer and see if that fixes the problem.

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If the problem is on your end, one of your browser’s extensions is likely causing the problem. Try disabling all of your browser’s extensions and see if that fixes the problem.

If the problem is still not fixed, you can try resetting your router. To do this, unplug your router from the power outlet and wait 30 seconds. After 30 seconds, plug it back in and wait for it to connect to the internet.

Change your DNS servers

If you are still having problems, you can try changing your DNS servers. If you have never changed your DNS servers before, you likely have the default ones assigned to you by your ISP. If your DNS server is not responding or your domain is not resolving the correct IP, it can result in a 502 error.

However, you can try using public DNS servers such as Google’s Public DNS.

To change your DNS servers in Windows, go to the Control Panel and click Network and Sharing Center. From there, click Change adapter settings and double-click your internet connection.

Click Properties,then click the Networking tab. From there, double-click Internet Protocol Version 4 (TCP/IPv4).

In the General tab, click Use the following DNS server addresses. Enter 8.8.8.8 for the Preferred DNS server and 8.8.4.4 for the Alternate DNS server.

Click OK to save your changes.

You can also change your DNS servers in your router’s settings. The process will vary depending on your router, but you will likely be able to find the DNS settings in the Network or Internet section of the router’s settings.

Once you have changed your DNS servers, try loading the website again.

Flush DNS cache

DNS caching can also cause 502 errors. When you visit a website, your computer stores certain information about that site in its DNS cache. This can help your computer load the website faster the next time you visit it. However, if this information is outdated, it can result in a 502 error.

To flush your DNS cache, open the command prompt and enter the following:

Windows: ipconfig /flushdns

Mac: sudo killall -HUP mDNSResponder

Linux: sudo /etc/init.d/networking force-reload

Once you have flushed your DNS cache, try loading the website again.

Temporarily disable Your CDN or firewall

Most servers use a content delivery network (CDN) such as KeyCDN. While very helpful (and important), these services can sometimes cause 502 errors. If you are using a CDN, try temporarily disabling it and see if that fixes the problem.

To disable your CDN in WordPress, go to the CDN tab in the Settings section of your WordPress dashboard and click the Disable CDN button. Click Save Changes.

In other CMSs, the process will be similar. Look for a CDN or Content Delivery Network settings page in your CMS’s dashboard and follow the instructions.

Similarly, your firewall could also be the cause of 502 errors. If you are using a firewall, try temporarily disabling it and see if that fixes the problem.

To do so, go to the Control Panel and click System and Security. From there, click Windows Firewall.

Click the Turn Windows Firewall on or off link in the left sidebar. If prompted for an administrator password or confirmation, enter the password or provide confirmation.

Click the Turn off Windows Firewall (not recommended) option for both private and public networks and click OK.

Summary

If you see 502 Bad Gateway errors, there are a few things you can do to try and fix the problem. Usually, this error code is an easy one to fix and requires one of the following:

  • Reload the page
  • Clear your browser’s cache
  • Restarting your computer or router
  • Flushing your DNS cache
  • Temporarily disabling your CDN or firewall

If you are still having problems, you can try changing your DNS servers. If you have never changed your DNS servers before, you likely have your ISP’s DNS servers configured. However, you can try using public DNS servers such as Google’s Public DNS.

Worst case scenario, you will have to contact your ISP’s customer support. They should be able to help you troubleshoot the problem and get you back online.

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15 Methods to Fix 502 Bad Gateway Error on Your Website

Are you frustrated with the error message”502 bad gateway” displaying on your computer again and again? And you are looking for a 502 bad gateway fix? Then you landed on the right page.

Since 502 bad gateway errors can be triggered due to plenty of reasons, it would be very difficult for anyone to figure out the exact root cause. It is because the problem can range from user-level i.e browser settings to your CDN to the server level.

So in this article, we tried to cover all the possible root causes and different methods by which you can easily fix 502 bad Gateway errors. But before that, let us understand what the error “502 bad gateway” means.

What is a 502 Bad Gateway Error?

The HyperText Transfer Protocol HTTP 502 Bad Gateway error usually comes from the server end and doesn’t have anything to do with your computer locally. This error states there has been an inadequate response from the other server. You can see this error on any device, browser, and operating system.

This error page can be modified by every website, in which case you will see a custom error page instead of the default error page above. Some other common server-side errors that you see are 504 Gateway Timeout Error, Error 500 internal server error, and dns_probe_finished_nxdomain.

Different Variations You Might See In The 502 Bad Gateway Error

There are different ways in which you might see 502 errors. Let’s have a look at the various messages that you might face due to the 502 error.

If you are experiencing a Server Error or 502 error when trying to access a site, it means that you are seeing a 502 Bad Gateway error. This error is also sometimes shown as :

  • HTTP Error 502- Bad Gateway
  • 502 Proxy Error
  • 502 Bad Gateway
  • 502 Service Temporarily Overloaded
  • HTTP 502
  • 502 Bad Gateway NGINX
  • Error 502

Impact of 502 Bad Gateway Errors on the SEO of Your Website

If this error displays on your computer screen, again and again, it will have a bad impact on your website’s reputation as well as on the Search Engines. In the end, it leads to a poor experience for the clients on a clear basis that, nobody needs to manage a site that as often as possible shows errors.

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If this error remains too long on your website, probably your website will be completely deindexed on the search engines as your website will not show any data to people leading to high bounce rates and dropping ranks.

Server failure and poor server management are two major reasons for triggering 502 bad gateway errors. You can stop this in the future by simply hosting or migrating your website to the most reliable and reputed web host, WPOven. Give your website mammoth growth with WPOven’s Fastest, and Fully managed Dedicated Servers.

5 Main Reasons that Cause 502 Bad Gateway Error

It is an error that you might see because the server was not able to provide a valid response to the request. Several other reasons might lead to a 502 error. Here are the most common reasons.

1. Origin Server Is not Working:

One of the reasons you might experience this error is that the server is not working properly. This means the server is not accessible; there can be many explanations for this, like, as either the server is down or there is a connectivity problem or there might be a very high amount of traffic on the server.

2. Domain Name:

Another reason for seeing a 502 Bad Gateway error is that the domain is not determining the right IP address. This usually occurs due to incorrect DNS records being set at the Domain hosting level. In case you have the correct DNS records set, you also have to keep in mind that changes in DNS can take time to propagate globally. This relies on various factors including time to live or TTL.

3. Block Request By Firewall:

The firewall is used to block the transmission between the servers. It is another common reason to face the 502 error. There is the possibility that your WordPress security plugins might block the communication between the servers or can even block your local or ISP IP. To rule this out, you can try accessing the site from a different Internet connection. Moreover, few DDOS protection systems are over-sensitive that start blocking the requests from servers.

4. Failure of the Server:

You might experience a 502 error if the server has completely failed. It can be due to a system crash or sometimes the server is taken offline for maintenance or similar reasons. This can also be because the content of the server might be violating the server provider’s terms and conditions.

5. Error in Browser:

Sometimes, some browser extensions can also lead to errors while rendering the website, particularly AdBlock extensions. Apart from this, rare cases might cause the error due to the browser version being outdated.

How To Fix The 502 Bad Gateway Error?

There are numerous things that you can try to resolve this problem. Mostly, the 502 errors are the result of bugs in the PHP or the Server configuration or network errors among servers. There is nothing wrong with your computer or your internet connectivity.

Nonetheless, in some cases, there might be a problem at your end with the browser, or your ISP or local IP might be blocked as mentioned earlier. With these fixes, you can try and resolve the 502 error.

Common Fixes of 502 Bad Gateway Error (For Users):

1. Refresh the webpage

When experiencing a 502 error, there are chances that the server of the website might be overloaded with a higher amount of traffic than it cannot handle. If this is the case, you can try to fix this by simply refreshing the webpage.

Alternatively, you can also press the keys Ctrl + R or F5 to refresh/reload the page. This error means there is a networking error that is beyond your control, so it can be a temporary error while the server is getting a large amount of traffic or the server could be under a DDOS attack. By trying again in a while, you might not see this again.

2. Try in Incognito Mode

Another way to fix this error is by starting a new Private or Incognito session in your browser. All you have to do is just close the existing tabs and open a new Private or Incognito window. If you experienced this error because of an issue on your browser, then starting your browser again in private mode should resolve the issue.

3. Clear the Cache Memory of your Browser

There is a chance that the corrupted files stored on your browser might be causing a 502 bad gateway error. So, if you clear the cache of your browser, you might resolve this error. Moreover, you should remove the cookies from your browser. It can also help in resolving this error.

4. Try Another Browser

You can try to use another browser such as Chrome, Safari, Firefox, and Internet Explorer. If you don’t see this error when you change your browser, this indicates that the problem was in the browser. You can even reinstall the browser to check if this resolves the problem.

5. Check Your DNS

Another solution for this error is by checking your domains’ DNS records. Sometimes the Bad Gateway error is caused by problems associated with DNS records. If you have not changed the DNS records, then you can also check if the IP in the records is set correctly and if there is no typo there.

6. Restart Your Network Device

First of all, You need to switch off the power supply of your internet modem. To do this, Unplug your internet modem and hold it up for 10 seconds. When its indicators are completely turned off, You need to plug it in again and turn on the power on button and Wait for your computer to establish a connection again.

Common Fixes for 502 Bad Gateway Error (Developers):

If you are a developer or a server manager and you are facing this error, there are chances that you might be facing this error because of other factors. You can try these solutions for eliminating the problem.

  • Check your server: You can determine whether your server is reachable or not by conducting a trace route or ping test on the server IP.
  • Check DNS: Another way to resolve this error is by checking if your fully qualified domain name is resolving properly or not, as mentioned above. You can use the DNS test tool for this purpose.
  • Clear Local DNS cache:You can also try to clear the DNS cache to see if this issue resolves or not. To do this you need to open your cmd prompt for windows users.
  • Open the command prompt on your windows pc and type ipconfig / flushdns then press Enter:
  • Check Error Logs: You can also check the server or site error logs created on the server to check if there is any particular error being thrown on the server. Using this error you can then try and resolve the issue. If you are a WordPress user you need to add the following codes in your wp-config.php
  • By doing this you will get all the information regarding the errors that have occurred due to any recently added application. And you will get all the causes of the errors which are produced by your website.
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define(‘WP_DEBUG’, ture);
define(‘WP_DEBUG_LOG’, ture);
define(‘WP_DEBUG_DISPLAY’, false);

  • Check Plugins and themes on your WordPress: For WordPress sites, you can temporarily rename the wp-content/plugins folder to rule out any error due to any plugin on the site. In case the issue is not due to the plugins, you can also check for the theme by downloading the default WordPress theme and switching over to that. In case the site loads fine after activating the default theme, then the issue might be due to your theme.
  • Check your firewall: It is advised to check the firewall logs for an unusual block. Sometimes Firewalls also prevent or block sites. To overcome this issue you need to temporarily disable your firewalls and check whether the issue persists or is resolved.
  • Disable CDN Temporarily: Another reason could be that the server is being targeted by a DDOS attack. In such cases, you may use services like Fail2ban to try and block the attacking IPs or you can use CDN providers like Cloudflare, to mitigate any DDOS attacks on the server. On the other hand, sometimes the 502 bad gateway error also triggers due to an issue with your CDN or firewall itself. These CDN providers or fully proxy services have extra firewalls between them, that help to protect against DDOS attacks.
  • Contact your hosting provider: If none of the above-mentioned methods work, you have the last and most important step to take, to contact your hosting service provider for assistance. Like with the best support of WPOven.

Therefore, you should not panic if you see 502 error Bad Gateway. It is an error that is related to a communication problem between the servers. By trying these solutions, you can get rid of this problem. In case this error continues for days, you can record the time and the version of your browser to submit a report to your hosting provider. You can get to know more about HTTP error codes by reading online.

Summary

As you can see from the above post, there are sufficient methods available combining both user and developer-friendly available, With the help of which you can troubleshoot and try to fix a 502 bad gateway error on your WordPress site.

Since this error triggers from the server side rather than the client side. It means the problem is not coming from either your website, computer, or internet connection. However, you should not forget to check out your third-party plugins or themes for bad codes or misconfigured files.

We hope, the methods mentioned in this post to fix 502 bad gateway errors will help you to bring your website to normal just like it was before the error. If you have any more methods or solutions, that we haven’t covered in this post, feel free to let us know in the comment section below.

General FAQ

How do I fix Error 502?

You can fix Error 502 by doing the following methods:
Refresh your browser and reopen it: First, you need to close your current browser and hold up a couple of moments and reopen it. It is because Sometimes your browser may stop responding due to accessing the heavy traffic of data at the same time or maybe an error page is inserted in between the pages which are loading. Even try on another browser as well.
Reset Internet configuration: You need to restart your internet modem. to do this, Unplug your internet modem and hold it up for 5 seconds, after it completely turns off, Plugs it in again and Wait for your computer to establish a connection again.
Disable CDN temporarily: The Content Delivery Network or commonly known as CDN improves the loading speed of a website but it can generate error 502 as well due to the firewalls. To overcome this issue, you can disable the CDN temporarily.

What does a 502 error mean?

Error 502 is an Html status code that defines The server works as a passage or proxy and got a not valid response from the server. It is classified as a server error. This kind of error shows a communication problem between the two servers. It happens when the user’s PC interfaces with a server that works as a gateway or as a proxy and that requirements to get to a server that is in a higher hierarchy and that gives extra support.

What causes 502 Bad Gateway Nginx?

A 502 error happens when one web server gets a response that is not valid from another web server. The servers that communicate do not agree on the protocol for exchanging information. This sort of error is normally for a short period, so we can later attempt to enter the web once more. More often, the issue is on the website itself, and there’s very little you can do. But, this 502 Bad Gateway Nginx error can happen due to an issue on your PC or your internet hotspot device.
The following are some reasons:
1. Browser configuration problem
2. Server overloaded
3. not correctly configured servers
4. Error in communication between two servers

What causes a 502 Bad Gateway error?

Error 502 or commonly known as 502 bad gateway can also be due to problems on the server side or the Website itself. On account of error 502, It is also possible that Your system or PC configuration doesn’t match the network standards, which can be assumed if the code shows up when attempting to open any page.
Causes of Error 502
1. Errors in PHP programming
2. Servers Overloaded
3. Browser problems
4. Communication problem between two servers
5. Server Crash

Does 502 bad gateway mean blocked?

If your computer screen displays an error message stating “502 bad gateway”, it means the server which is acting as a proxy or gateway is not getting adequate response from another server. But this is a generic error, you won’t be able to find out the root cause.
So, one can’t say, whether it is blocked or not without conducting any further investigation.

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