Error 503 Backend fetch failed

[onplayer]

Sometimes hosting response:

Error 503 Backend fetch failed
Backend fetch failed

Guru Meditation:
XID: 10752859

Varnish cache server

I added line in .htaccess file:

Header set Cache-Control "max-age=0, private, no-cache, no-store, must-revalidate"

But it did not help. Such responses are still sometimes come...

Is it possible to completely disable Varnish cache server?

 

[caftpx10]

I would say no, unless you want every other site to be affected.
The Varnish Cache Server is a little bit like a web server but it's a "pass-thru" acting similarly to a reverse proxy.
When you use that line to disable Varnish Caching, that's just an option for Varnish. It would have caching disabled but you would still go through it.
When it fails to communicate successfully with the webserver that it has been configured to point to, you would get the error you had mentioned. Because of the hanging, I could only assume that the Apache web server was struggling (perhaps with resources) and so it timed out.

 

[onplayer]

What should I do to avoid this error?

 

[caftpx10]

As this is shared hosting, nothing.

Only the people who are able to modify/manage the server(s) are able to do the appropriate tweaks to reduce how often this happens.

 

[Dead-i]

Hi,

The "503" error is a generic error message for when the web server fails to respond to Varnish in time. Although we can't completely disable the Varnish cache server, it is unlikely to fix the original error even if we could. How often does this error message show? Please could you provide me with the full URL to the affected page?

Thank you,

 

[onplayer]

As this is shared hosting, nothing.

Only the people who are able to modify/manage the server(s) are able to do the appropriate tweaks to reduce how often this happens.

Understand! Thank you! Please close thread.