Why am I getting a 'backend fetch failed' error?

The website’s data pile up in cache server memory, leading to the ‘Backend fetch failed’ error. The website’s server is undergoing maintenance. If the website server you are trying to visit is under routine/temporary maintenance, your requests will queue up, and you’ll get the 503 error on your browser.

How to fix Error 503 backend fetch failed?

To fix the error 503 backend fetch failed, reboot your computer, ping your router, clear browser cache or reset your browser. Keep reading to learn the detailed steps. If you have encountered the error 503 Backend Fetch Failed Varnish cache server while browsing the internet, this guide can help!

Why is backend fetch failed not working Magento?

One user said the issue was caused by a plugin of the hoster. Once the faulty plugin was disabled, the Backend Fetch Failed error was resolved. Another user reported that the maintenance.flag file generated by Magento was causing the issue for them.