Varnish 503 error

Ragnar Kurm ragnar at
Tue Apr 29 21:13:55 CEST 2014

> 12 FetchError   c http first read error: -1 0 (No error recorded)


Got into same situation myself and replying mostly for documentation 
since your original post was quite some time ago.

Found that Apache was closing keep-alive connection improperly in some cases
(at least this is how I understand keep-alive).

Varnish sent request during keep-alive session,
Apache closed connection in return.

Apache configuration "KeepAlive Off" solved it for me.
For complete details I posted my findings here:


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