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Date: Thu, 07 Oct 2010 18:50:24 +0900
From: Yu Kikuchi <kikuchi.yu@jp.fujitsu.com>
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Subject: [users@httpd] mod_proxy_ajp failed to connect infrequently

Hello.

Apache wrote such as following messages into error_log and returned HTTP 500/503 error infrequently.

[error] (104)Connection reset by peer: ajp_ilink_receive() can't receive header
[error] ajp_read_header: ajp_ilink_receive failed
[error] (120006)APR does not understand this error code: proxy: read response failed from xxx.xxx.xxx.xxx:8009
(xxx.xxx.xxx.xxx)

I have installed Apache and JBoss Application Server into the same server.
I suspected mod_proxy_ajp caused the errors because JBoss hasn't logged any messages and left indications of abort.

After the setting of "ping" options, the errors disappeared instead of cping/cpong retry occurrence. Exactly:

---------------------------------------------------
<Location /test>
  ProxyPass ajp://xxx.xxx.xxx.xxx:8009/test ping=1
</Location>
---------------------------------------------------

I examine prior occurrences, but nobody told about the cause of this phenomenon.
Does anybody tell me why the errors came up?

Best regards.


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