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From Yu Kikuchi <>
Subject [users@httpd] mod_proxy_ajp failed to connect infrequently
Date Thu, 07 Oct 2010 09:50:24 GMT

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

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.

<Location /test>
  ProxyPass ajp:// ping=1

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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