mod_proxy issue - intermittent 502 response

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Hi,

 

I’m running Apache/2.0.52 as a reverse proxy on a RHE4 box, the backend app server is on a separate machine again RHE4, running Apache/2.0.52 and mod_perl 1.99_16.

 

There are intermittent 502 responses being generated by the proxy although a page refresh generally resolves the issue, we are trying to get a configuration of 2 RP boxes in front of 3 mod_perl app servers into production but will need to understand / resolve the issue of these intermittent 502 responses first.

 

[Thu Nov 26 15:35:09 2009] [error] [client 88.96.233.45] proxy: error reading status line from remote server xxx.xxxxxx.co.uk, referer: http://xxx.xxxx.co.uk/mens/casual/casual/71/brand-/all-/start-

[Thu Nov 26 15:35:09 2009] [error] [client 88.96.233.45] proxy: Error reading from remote server returned by /mens/smart/smart/70/brand-/all-/start-, referer: http://xxxx.xxxxxxx.co.uk/mens/casual/casual/71/brand-/all-/start-

 

Can someone shed further light on what the problem is and how to resolve it pls, I’m happy to send virtual host confs if someone wishes to dig little deeper. Note at this point I’m using mod_rewrite [P] to proxy the requests to the app server rather than using ProxyPass as we have many rewrites in the conf.

 

I’ve googled around and have seen that others have observed similar scenarios when using this setup in Apache 2.0 but have not seen anything specific about a resolution or path to resolution.

 

Your help gratefully appreciated.

 

Kind regards,

 

Cris

 

Cristian Pini

Foresite Business Solutions Ltd

Tel: 020 8540 0040

Direct: 020 8545 6813

http://www.fsite.com

 


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