Error 503 Backend Fetch Failed error conveys the message that the server of the internet website is not operating. It is a standard Hypertext Transfer Protocol response pop-up shown by internet servers. To ensure the development of a Magento, some system contributes and make it easy for the corporation to utilize and pinpoint where the difficulty lies when a website is not running as demanded.

Error 503 Backend Fetch Failed error occurs when the connection closes before Fastly cache servers are done reading the response. To Fix Error 503 Backend Fetch Failed, Refresh and Update the Webpage, Contact the official Administrators, Rectify using Reboot, Try assistance from Social Media, etc.

Error 503 Backend Fetch Failed error generally occurs when there is a removed or void Content and Length header on the response option, although other sources may lead to the failure. Here are some best quick ways to fix the error. Keep reading this article to know more.

What leads to the Error 503 Backend Fetch Failed

The error may be an aftereffect of the server not having sufficient memory, or it may be the case that there is an excessive number of solicitations lining up. The accident of the application pool, which serves the site, could be another explanation behind the event of the blunder.

error 503 backend fetch failed

The application may crash multiple times in less than five minutes, and a speedy come-up short happens, which results in the application pool being put out of activity by the IIS. The expiry of the SSL affirmation is known to cause the “error 503 backends fetch failed” error.

Back to the subject, the status code of this error is 500 and is what might be compared to an inward server mistake. This blunder happens on all internet browsers, working frameworks, and cell phones.

10 Ways to Fix Error 503 Backend Fetch Failed

Method #1 Refresh and Update the Webpage

Sometimes just refreshing the page again will control the problem. To solve it, follow the steps one by one:

  1. Go to the website and sign in. For that, website accessibility is needed to navigate to Host Server using an FTP Client like “FileZilla” or Using Website Host cPanel “Document administrator.”
  2. Afterward, go to the Magneto site, pull the registry, and look for the account “maintenance. Flag.” Make sure you erase it.
  3. Refresh the Magento site. If the error is still there, then try an alternate refresh solution.  Refresh the website page or press F5 to proceed. While the 503 issue is a concern of another PC, it may be a precise issue, and once in a while, refreshing can help remove the error.

See Also: 4 Ways to Fix the NET::ERR_CERT_AUTHORITY_INVALID Error

Method #2 Rectify using Reboot

Rectify by rebooting the switch and, for instance, rebooting the device you are using. I the code titled “Administration Unavailable – DNS Failure” is popping up at that point, a reboot of the framework on your side will complete the rest of the work. reboot-pc This is because, occasionally, the error is because of issues with the DNS server, which can be rectified with a reboot.

Method #3 Contact the official Administrators

Directly contact the website for guidance. In most cases, the website’s administrators already know about the 503 error, but you should let them know or verify the status of the problem to confirm. contact the official administratorsSee our Website Contact Information list for contact information for popular websites. Most sites have support-based social network accounts; some even have phone numbers and email addresses.

Method #4 Estimate the Total Memory Usage

The amount of memory that Varnish will use depends on the number of requests it receives. Higher the number of requests, the higher the memory consumption. Initially, look for the Hosting Support Engineers at the official link, the total memory usage

After that, properly examine the number of website visitors on the server. Then, measure the total memory routine. And we add supplementary memory for the varnish cache to avoid further difficulties.

Method #5 Look for the Varnish Interface

Similarly, the Hosting Support Engineers adjust the varnish port, IP address, and other domains from the CentOS Web Panel.

And, when there is enormous pressure on the server, even after configuring once again the Varnish cache, one can disable the Varnish cache from the CentOS web panel (CWP). To do such, follow some simple steps in a blink of an eye:

Go to CWP and log in. Look for Apache Settings from the menu drop-down.

go to cwp and login

Transform the Webservers

Method #6 Keep Patience and Wait for a While

Sometimes the error occurs due to overuse of the device. Keep Patience and try again fixing again later. ”Error 503 backend fetch failed” is remarkably consistent when a server load is caused by many visitors and individuals like one of us.error 503 backend fetch failed

The best approach in such a case is to delay and try again after a short period. This error disappears once the site is free and devoid of many users.

Method #7 Look for the Plugins

The Varnish plugin, or its absence, is a vital source of the error 503 issues. If you have a problem on your site, check if the Varnish plugin’s power is on. For those of you who don’t have the foggiest idea, Varnish comes in use to build the site’s speed and is also in use by facilitating firms. pluginsThe facilitating firm needs a call if the module is empowered on the server.

Method #8 Try assistance from Social Media

In today’s modern world, where our lives are in tangles with social media, why can’t we get errors in our laptops fixed by using this platform only? There are a lot of links on youtube that provide solutions with video tutorials to fix technical issues.

One such tutorial video to fix this error you can learn through upload by the Naiwik Tech Vlogger. There is a chance that the issue is with your PC, but the chances of this are very moderate.

According to this tech vlogger, your Magento installation will illustrate the code “Error 503: Service Temporarily Unavailable” page after you’ve set up or refreshed as an extension by utilizing Magento Connect.assistance from social media

In addition to this, the error happens because the website is in support mode by the “maintenance.flag” file within the Magento website root directory. You must switch to “maintenance.flag” to solve this issue.

Method #9 Reset the Router and Restart

Sometimes there is a chance that a DNS can cause the problem, and a short restart of the switch can simply resolve the Error 503 Backend Fetch Failed error.

reset button

The “administration inaccessible DNS disappointment” could solve the issue with the DNS action course and further restarting and resetting it.

Method #10 Repair the Windows

This technique is the final retreat in such a case that nothing works out. Then this strategy will fix all issues with your PC. Setting the Install uses a setup move-up to repair problems with the system without erasing client information on the the windows


How can I fix 'error 503 backend fetch failed'?

You can try refreshing the page, clearing your browser's cache and cookies, or contacting the website administrator. If the problem persists, contact your internet service provider.

Can 'error 503 backend fetch failed' be caused by a virus?

No, 'error 503 backend fetch failed' is not typically cause by viruses or malware.

Is 'error 503 backend fetch failed' a serious issue?

'Error 503 backend fetch failed' can be a serious issue if it prevents you from accessing essential websites. However, it is usually a temporary issue that can be resolve.

Does 'error 503 backend fetch failed' affect all websites?

'Error 503 backend fetch failed' usually only affects certain websites. Other websites should still be accessible.

Can 'error 503 backend fetch failed' affect my internet speed?

No, it should not affect your internet speed directly.


Error 503 Backend Fetch Failed happens mainly due to memory allocation issues or bad varnish cache configuration. The article mentions the leading causes of this error and possible solutions for the same. The website sends the message that the server isn’t operating correctly.

It is a standard HyperText Transfer Protocol response message popping up by the websites. Such codes make it easier for a Magento improvement firm to further investigate and point out where the problem lies when a site isn’t loading in properly.


Please enter your comment!
Please enter your name here