nginx upstream prematurely closed connection

[Ramy Allam]

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/1.0.11

Apache/2.2.22

PHP 5.2.17

Thanks

[Maxim Dounin]

Hello!

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

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