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Date: Sun, 27 Apr 2008 10:05:57 +0200
From: Rainer Jung <rainer.jung@kippdata.de>
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To: Tomcat Users List <users@tomcat.apache.org>
Subject: Re: CPong error
References: <16918132.post@talk.nabble.com>
In-Reply-To: <16918132.post@talk.nabble.com>
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darinpope schrieb:
> We've been doing some reconfiguration to try to track down some issues and
> with one of the changes, we are now getting a number of errors (but not all
> the time) like this one:
> 
> [8624:1188] [info] jk_ajp_common.c (840): awaited reply cpong, received 3
> instead
> [8624:1188] [info] jk_ajp_common.c (1237):
> (810ED18641A24B1784CF0575992D73C7) error sending request. Will try another
> pooled connection
> [8624:1188] [info] jk_ajp_common.c (1272):
> (810ED18641A24B1784CF0575992D73C7) all endpoints are dead
> [8624:1188] [info] jk_ajp_common.c (1281):
> (810ED18641A24B1784CF0575992D73C7) increase the backend idle connection
> timeout or the connection_pool_minsize
> [8624:1188] [info] jk_ajp_common.c (2085):
> (810ED18641A24B1784CF0575992D73C7) sending request to tomcat failed, 
> recoverable operation attempt=1
> 
> In all instances of the error, it always says "received 3 instead".

3 ist a JK_AJP13_SEND_BODY_CHUNK packet. We are waiting for a 9 
(AJP13_CPONG_REPLY). So this is a protocol error. Very strange. Not a 
known problem.

What's special about "one of the changes"?

Can you easily reproduce, or will it happen only sporadically?

> Any idea what could be causing this issue?
> 
> Thanks,
> 
> Darin
> 
> OS (Tomcat and Apache): Windows 2003 Service Pack 2
> Tomcat: 5.5.25
> mod_jk: 1.2.25
> Apache: 2.2.6 (ApacheLounge version)
> 
> workers.properties:
> worker.template-worker.connection_pool_timeout=600
> worker.template-worker.connect_timeout=10000
> worker.template-worker.prepost_timeout=10000
> worker.template-worker.reply_timeout=60000
> worker.template-worker.max_reply_timeouts=3
> worker.template-worker.socket_timeout=30
> worker.template-worker.socket_keepalive=true
> worker.template-worker.type=ajp13
> worker.template-worker.lbfactor=1
> worker.810ED18641A24B1784CF0575992D73C7.reference=worker.template-worker
> worker.810ED18641A24B1784CF0575992D73C7.host=192.168.1.100
> worker.810ED18641A24B1784CF0575992D73C7.port=8209
> 
> server.xml AJP:
> <Connector port="8209" enableLookups="false" protocol="AJP/1.3"
> maxThreads="1000" connectionTimeout="600000" />

Regards,

Rainer

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