What is Error 503 Backend Fetch Failed and How to resolve it?

August 24, 2020

Are you facing Error 503 Backend fetch failed? This is also one of the HTTP status codes; web site servers give standard response codes on the Internet. The codes help identify the cause of the problem when a web page or other resource is not loaded correctly.

In this situation, Error 503 Backend fetch failing is one of the HTTP status lines is the status code of 500 and is the HTTP reason phrase of Internal Server Error.

This group of HTTP status codes involves those where the request for a web page or other resource is understood by the web site’s server but is incapable of filling it for some reason.

A 503 error message can be customized by the Website it appears on or the server software that generates it, so how you might see it vary greatly.

error 503 backend fetch failed backend fetch failed

What Is “Error 503 Backend Fetch Failed”?

“Error 503 backend fetch failed” is a source to the status of a website. Put, it conveys the message that the server of the site isn’t functioning. It is a typical HyperText Transfer Protocol response message shown by websites.

Such codes make it easy for a Magento development company to troubleshoot and pinpoint where the problem lies when a website is not working as expected.

Back to the subject, the status code of this error is five hundred and is the equivalent of the internal server error. This error occurs on all web browsers and all operating systems, even on smartphones.

How You Might See the 503 Error                      

Here are the most usual ways you might see the “service unavailable” error:

  • 503 Service Unavailable 
  • 503 Service Temporarily Unavailable 
  • Http/1.1 Service Unavailable 
  • HTTP Server Error 503 
  • Service Unavailable – DNS Failure 
  • 503 Error 
  • HTTP 503 
  • HTTP Error 503 
  • Error 503 Service Unavailable 

rror 503 backend fetch failed varnish

How to Fix “Error 503 Backend Fetch Failed”?

As you might have understood from the above text, this error is generally a fault from the website’s backend.

There is a possibility that the issue is with your PC, but its chances are meager. Since we like YouTube fixes, check out this popular suggestion from the Naiwik Tech vlogger:

According to the tech vlogger, your Magento installation will display the following code: “Error 503: Service Temporarily Unavailable” page after you’ve set up or up-graded an extension by using Magento Connect.

According to the vlogger, the error happens because your website is converted into maintenance mode by the “maintenance.flag” file within the Magento website root directory. You have to eliminate “maintenance.flag” to solve this issue.

Steps to resolve “Error 503: Service Temporarily Unavailable”:

  1. First, log in to the website host
  2. You have to gain access to your website Host Server using an FTP Client like “FileZilla” or to use Website Host cPanel “File manager.”
  3. Navigate to the website root directory & look for the file “maintenance.flag” and, he says, you should then remove it.
  4. Then refresh the website.

The 503 Service Unavailable error is a server-side error, meaning the issue is usually with the web site’s server. Your computer may have some problem that’s causing the 503 error, but it’s unlikely.

There are a few methods which could resolve your issue:

    1. Retry the URL from the address bar repeatedly by clicking the reload/refresh button or pressing F5.
    2. Even though the 503 Service Unavailable error means that there’s an error on another computer, it is probably only temporary. Sometimes just trying the page again will work.
    3. If the 503 Service Unavailable error information arrives while paying for an online buying, be conscious that multiple efforts to checkout may end up creating multiple orders – and added charges! Most payment systems and some credit card companies have security from this kind of thing, but it’s still something to be aware of.
    4. Restart your router and modem, and then your system or device, especially if you’re seeing the “Service Unavailable – DNS Failure” error.
    5. While the 503 error is still common likely the issue of the website you’re visiting, it’s possible that there’s an issue with the DNS Server configurations on your router or system, which a simple restart of both might correct.
    6. If resetting your equipment didn’t correct the 503 DNS Failure error, there may be a temporary error with the DNS servers themselves. In this case, pick new DNS servers from any Free and public servers online and change them on your computer or router.
    7. An extra option is to contact the website directly for help. There’s a big chance that the site’s administrators already know about the 503 error, but letting them know, or checking the status on the problem, isn’t a bad idea.
    8. Come back later. Since the 503 Service Unavailable error is a standard error message on popular websites when a massive increase in traffic by visitors (that’s you!) is overwhelming the servers, only waiting it out is often your best bet.
    9. Frankly, this is the common likely “fix” for a 503 error. As more and more visitors leave the website, the chances of a successful page load increase.

If you are checking up solutions to this issue, there is a chance you own a website and are suffering from the same problem. For those of you trying to resolve this from the backend, here are a couple of solutions to fix this.

Fix If there is a Plugins

A pivotal culprit to the error 503 issue is the Varnish plugin or the lack of it. If you have the problem on your website, check if the Varnish plugin is enabled. For those of you who do not know, Varnish is used to increase the site’s speed and is used by hosting firms. If the plugin is enabled on the server, well, the hosting firm needs a call!

Restart Your Router 

If a DNS breakdown is on the cards too, a simple restart of your router should resolve it. The “service unavailable DNS failure” could signal an issue with the DNS arrangement, but restarting it should reset it to normal.


What is a 503 error?

The HyperText Transfer Protocol (HTTP) 503 Service Unavailable server error response code symbolizes that the server is not ready to handle the request. Common reasons are a server that is down for maintenance, or that is overloaded.

What can cause a 503 error?

A 503 Service Unavailable Error is an HTTP response status code indicating that a server is temporarily unable to manage the request. This may be due to the server being loaded or down for maintenance.

How do I get rid of error 503?

1. Reboot your server. 2. Verify to see if your web server is going through maintenance. 3. Fix faulty firewall configurations. 4. Sift through your server-side logs. 5. Comb through your website's code to find bugs.


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