upstream prematurely closed connection while reading response header from upstream,

[Maxim Dounin]

Hello!

On Fri, Nov 20, 2009 at 04:43:49PM -0800, kevin wrote:

> i get this error on nginx log periodically:
> 
> 
> 2009/11/20 16:37:15 [error] 65325#0: *100877 upstream prematurely closed
> connection while reading response header from upstream, client:
> 69.63.178.251, server: XX.com, request: "POST /ping HTTP/1.1", upstream:
> "fastcgi://A.B.C.D8495", host: "X.Y.Z"
> 
> 
> nginx version: nginx/0.8.27
> built by gcc 4.4.1 20090725 (Red Hat 4.4.1-2) (GCC)
> configure arguments: --prefix=/opt/local --with-http_stub_status_module
> --with-http_geoip_module --with-http_realip_module
> 
> 
> how to fix this problem?
> thank you!

Looks like your backend dies for some reason.  You should fix 
backend.

Maxim Dounin