I have some strange error messages in mod_jk.log that I cannot explain, and
that I need to resolve urgently.
Server:
Dual Xeon 2.5Ghz server.
Windows 2000 Professional SP3
Apache 2.0.44
Tomcat 4.1.18
Mod_jk 1.2.2
[Mon Feb 17 14:49:38 2003] [jk_ajp_common.c (681)]: ERROR: can't receive
the response message from tomcat, network problems or tomcat is down.
[Mon Feb 17 14:49:38 2003] [jk_ajp_common.c (1050)]: Error reading reply
from tomcat. Tomcat is down or network problems.
[Mon Feb 17 14:49:38 2003] [jk_ajp_common.c (1187)]: ERROR: Receiving from
tomcat failed, recoverable operation. err=0
[Mon Feb 17 14:49:38 2003] [jk_ajp_common.c (681)]: ERROR: can't receive
the response message from tomcat, network problems or tomcat is down.
[Mon Feb 17 14:49:38 2003] [jk_ajp_common.c (1050)]: Error reading reply
from tomcat. Tomcat is down or network problems.
[Mon Feb 17 14:49:38 2003] [jk_ajp_common.c (1187)]: ERROR: Receiving from
tomcat failed, recoverable operation. err=1
[Mon Feb 17 14:49:38 2003] [jk_ajp_common.c (681)]: ERROR: can't receive
the response message from tomcat, network problems or tomcat is down.
[Mon Feb 17 14:49:38 2003] [jk_ajp_common.c (1050)]: Error reading reply
from tomcat. Tomcat is down or network problems.
[Mon Feb 17 14:49:38 2003] [jk_ajp_common.c (1187)]: ERROR: Receiving from
tomcat failed, recoverable operation. err=2
[Mon Feb 17 14:49:38 2003] [jk_ajp_common.c (1198)]: Error connecting to
tomcat. Tomcat is probably not started or is listenning on the wrong port.
Failed errno = 0
The line 'ERROR: Receiving from tomcat failed, recoverable operation. err=0'
happens all the time but when the above happens i.e. err=0 -> err=1 -> err=2
the browser is returned an error 500. I have a much slower box (P4 1.7Ghz)
that gets the err=0 line all the time but never gets the err=1 and err=2
lines and therefore never responds with an error 500.
I have a feeling that there is a retry that is happening but the box is so
quick the threads on the Tomcat side aren't refreshed before Apache gives
up. If this can be fixed by changing the config files then I think this
should be noted in the docs otherwise this is a bug!?!?
Here is the relevant parts of the config.
Server.xml:
<Connector className="org.apache.coyote.tomcat4.CoyoteConnector"
port="8009" minProcessors="5" maxProcessors="75"
enableLookups="true" redirectPort="443"
acceptCount="10" debug="0" connectionTimeout="20000"
useURIValidationHack="false"
protocolHandlerClassName="org.apache.jk.server.JkCoyoteHandler"/>
workers.properties:
worker.ajp13.port=8009
worker.ajp13.host=localhost
worker.ajp13.type=ajp13
worker.ajp13.lbfactor=1
worker.ajp13.cachesize=10
worker.ajp13.cache_timeout=600
Thanks for your help.
Dave Oxley
Development Team Leader
Workplace Systems Plc
* +44 (0)118 9515 755
* <mailto:[EMAIL PROTECTED]>
[EMAIL PROTECTED]
* <http://www.workplace-systems.plc.uk/>
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