503 Error with Varnish - What does this mean?

Kervin L. Pierre kervin at adevsoft.com
Mon Jul 30 16:38:33 CEST 2012

Varnish throws 503 errors for a variety of underlying reasons.  You may need to check "varnishlog" to get some more information, the "FetchError" tagged messages will help you narrow down the cause.

It can be that one of a variety of timeout values have been exceeded, backend is intermittently available, etc. 

Best regards,

Adevsoft Inc
Business Software Development

> -----Original Message-----
> From: varnish-misc-bounces at varnish-cache.org [mailto:varnish-misc-
> bounces at varnish-cache.org] On Behalf Of Donny Ouyang
> Sent: Tuesday, July 10, 2012 4:18 PM
> To: varnish-misc at varnish-cache.org
> Subject: 503 Error with Varnish - What does this mean?
> Hey guys,
> I am receiving a 503 error when trying to load my online whiteboard
> application (managed by Varnish) after re-sizing my cloud server. Does
> anyone know if this is related to a setting that I will need to modify,
> and if so, where I should look first?
> Thanks!
> Donny
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