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I'm running apache2 with mod_proxy to forward certain requests to an nginx server running on the same machine. Occasioanaly the Apache server will stop responding all together until a restart. Checking the httpd.log shows the following lines happening every second or 2:

The timeout specified has expired: proxy: error reading status line from remote server localhost proxy: Error reading from remote server returned by /

I've searched google for an answer but found nothing definitive other than people mentioning mod_proxy as the cause.

Does anyone have a clue where to look next or even how to solve it?

Thanks, J

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Do you have KeepAlive enabled in your ProxyPass directive? I've seen this before, and in nearly every case, KeepAlive was the culprit.

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I did have KeepAlive set so it was more than likely the culprit. I decided to remove Apache from the equation all together and open up the nginx port so stop it happening again. Thanks – JWood May 23 '11 at 9:25
Actually, you would actually want to have KeepAlive enabled -- you just need to ensure that the timeouts in Apache and Nginx match. – atbell May 24 '11 at 5:41
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