The error message “Error 503: backend fetch failed” is a Hypertext Transfer Protocol (HTTP) response message error.
It is possible to run into it regardless of the device, operating system, or browser you are using. It has something to do with the website you’re attempting to access.
It means that the server isn’t working properly and isn’t responding properly. When a website’s server receives more requests than it can handle at one time, the error occurs.
When you access a site and it fails to respond or responds slowly, requests are queued up that the server may not be able to handle. This may cause your browser’s cache memory to become occupied, resulting in the backend fetch failed error.
Following are the Causes Of “Backend fetch failed Error 503″:
1- Slow Internet Connection:
A major cause of error 503 in your browser is a problem with network connectivity or slow internet speed. The website takes too long or fails to load, causing requests to pile up. The data from the website then accumulates in cache server memory, resulting in the ‘Backend fetch failed’ error.
2- The Website’s Server Is Being Serviced:
If the server of the website you are attempting to visit is down for routine/temporary maintenance, your requests will be queued and you will receive a 503-error message in your browser.
3- The Following Website was Flagged as Suspicious & Blocked:
If you have an ad-blocker enabled on your browser and try to access a website with a lot of ad content, the ad-blocker will prevent such content from loading.
As a result, requests pile up, leading to the error being discussed. Other security tools on your browser may also prevent suspicious websites from loading, resulting in the error you are experiencing.
Resolving The 503 Backend Fetch Failed Varnish Cache Server Error:
Fix 1: Reload The Page:
When a website fails to load, the first thing you should do is click the Refresh button. So, if you’re seeing the backend fetch error 503 right now, it’s a good idea to refresh the page. If you do this a few times (at least two or three times), you might be able to get past the error. If that doesn’t work for you, move on to the next solution.
Fix 2: Close Multiple Tabs:
Close any other open tabs in your browser to reduce the load on the cache memory. If your internet connection isn’t strong enough, this could help.
Fix 3: Use A Different Browser:
multiple processes running in the background, tend to hinder browsing speed and cause the 503 error. Perhaps your browser’s settings are preventing the page from loading. Try visiting the website with a different browser to see if it loads.
Fix 4: Reboot Your Wi-Fi Router:
This is a good solution to try, especially if you are receiving the “Backend fetch failed: Error 503” message on multiple websites. You may be experiencing internet connection problems, which can be resolved by rebooting your router.
Restart your computer after closing your browser. Then, turn off your router and wait about 30 seconds before turning it back on. Relaunch your browser and try again to access the website.
Fix 5: Use a Reliable PC Maintenance Program:
As previously stated, one of the main causes of the error in question is slow internet speed. This could be related to your PC’s internet connection settings.
Auslogics BoostSpeed can automatically resolve this problem. The tool was created by a Microsoft Silver Application developer and is trusted and recommended by experts all over the world.
BoostSpeed performs a scan to identify all suboptimal settings on your computer. Then, using precise techniques, it fine-tunes them to ensure the best performance.
Fix 6: Reset Your Browser:
Resetting your browser is a reasonable course of action if the majority of the websites you visit display the “Error 503: backend fetch failed” message on your browser but load successfully on another device or browser.
How Do I Fix Error 503 in Chrome?
If websites continue to display error 503, follow the steps below to reset your Chrome browser:
- Start your Chrome browser.
- In the top-right corner of the window, click the ‘More’ icon, which appears as three vertical dots. A drop-down menu will appear.
- Select Settings.
- To expand the menu, scroll down to the bottom of the page and click the downward-pointing arrow beside Advanced.
- Scroll all the way down to the Reset and Cleanup section (If you are using Chrome on a Windows operating system). Scroll down to the Reset Settings section if you are using Chrome on a Chromebook, Linux, or Mac OS.
- select“Restore settings to their original defaults”. After that “Help by reporting the current settings”. Then, on the Reset Settings page, click the Reset Settings button.
- Restart your browser to see if the problem has been resolved.
Keep in mind that a reset restores your browser’s default settings. Your bookmarks, browsing history, and saved passwords will not be deleted, but the following changes will be applied to all devices where you are signed in:
- If you set a different search engine as your default, it will be reset to Google.
- Your pinned tabs will be un-pinnable.
- Allowing a website to use your microphone or show popups, for example, will be reset.
- The cookies and site data will be cleared.
- Browser extensions are deactivated. If you want to reactivate them after the reset, go to the browser menu and select More Tools > Extensions.
- The theme of your browser will be reset.
Fix 8: Enable The Varnish Plugin:
If you own a web-based business, you must ensure that the Varnish plugin is enabled in order to improve the speed of your website. It is a type of web accelerator that works as a proxy server to reduce the time it takes to load a specific website. To enable the varnish plugin, follow these steps:
- Launch your WordPress administration page by entering your login credentials on your desktop PC.
- Navigate to the “Plugins” option.
- on the left pane on the menu look for “Add New”.
- Locate the “Varnish” plugin here.
- Pick “Plugin” and then the “Add Plugin” option.
- When the plugin has been successfully added, click the “Activate Plugin” button.
Fix 9: Plugins Should Be Deactivated (WordPress Users):
Another possible solution if you encounter this error on your WordPress site is to try deactivating the installed plugins on your site.
You can simply continue by opening the dashboard and selecting the “Plugins” option from there. You will be taken to a window where you can see all of the installed plugins, so all you have to do now is find the specific plugin that you want to deactivate.
Right-click on it and select deactivate, but you can always reinstall it if you need it again in the future.