10 Ways to Fix Error 503 Backend Fetch Failed


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 assure 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. Error 503 Backend Fetch Failed error generally occurs when there is a removed or void Content and Length header on the response option, although there may be other sources leading to the failure.

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
Error 503 Backend Fetch Failed

The application may crash multiple times in less than five minutes, 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 inward server mistake. This blunder happens on all internet browsers and every working framework, even on cell phones.

X 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 further navigated to Host Server by using an FTP Client like “FileZilla” or Using Website Host cPanel “Document administrator”.
  2. After that go to the Magneto site pull 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 do 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. This is on the grounds that 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. See our Website Contact Information list for contact information for popular websites. Most sites have support-based social network accounts and 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, higher memory consumption. Initially look for the Hosting Support Engineers at the official link, https://bobcares.com/dedicated-support/

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

Method #5 Look for the Varnish Interface

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

And, when there is large pressure in the server even after the 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 with a blink of an eye:

  1. Go to CWP and Login
    go to cwp and login
    Go to CWP and Login
  2. Look for Apache Settings from the menu drop-down
  3. 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 particularly consistent when there is a server load caused by many visitors and individuals like one of us.

The best approach in such a case is to delay and try again after a short period of time. Once the site is free and devoid of many users, this error goes away.

Method #7 Look for the Plugins

A key source to the error 503 issue is the Varnish plugin or its absence. On the off chance that you have the 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 speed of the site and is also in use by facilitating firms. If the module is empowered on the server, well, the facilitating firm needs a call.

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 laptop fixed by using this platform only. There are a lot of links on youtube that provides solutions with video tutorials to fix a technical issue.

One such tutorial video to fix this error can be learn through is 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 following code: “Error 503: Service Temporarily Unavailable” page after you’ve set up or refreshed as an extension by utilizing Magento Connect.

In addition to this, the error happens because the website is change into support mode by “maintenance.flag” file within the Magento website root directory. You have to 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 straightforward restart of the switch can simply resolve the Error 503 Backend Fetch Failed error.

reset button
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 PC.


Error 503 Backend Fetch Failed happens mainly due to memory allocation issues or bad varnish cache configuration. In the article it mentions the main causes of Error 503 Backend Fetch Failed error and possible solutions for the same. The website passes on the message that the server of the site isn’t operating properly.

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