nginx upstream prematurely closed connection

[Maxim Dounin]

Hello!

On Thu, Mar 29, 2012 at 03:51:31PM +0000, Ramy Allam wrote:

> Hello,
> I'm using nginx as a reverse proxy to handle static files with apache to handle dynamic file .php
> I'm receiving too many errors ( Bad Gateway 502 ) when i'm using vBulletin , joomla , wordpress in PHP Post or curl() inside php.
> I reviewed log i noticed this error is frequently appears:
> "upstream prematurely closed connection while reading response header from upstream"
> Nginx version: nginx/1.0.11Apache/2.2.22PHP 5.2.17
> Thanks 		 	   		  

Such messages usually appear due to upstream server crash and/or 
process termination due to some limits (memory, cpu, execution 
time...).  Try looking into apache logs and/or system logs to see 
what happens.

Maxim Dounin