Apache-Tomcat threads stuck in CLOSE_WAIT

[smily_03]

Hi everyone,

After several days of runtime, one of our GroupWise WebAccess server stops responding, giving a 503 error. Apache and Tomcat are still running, but the Apache error_log is full of lines that say:

[Mon Oct 26 09:23:10 2009] [error] ajp_read_header: ajp_ilink_receive failed
[Mon Oct 26 09:23:10 2009] [error] (120006)APR does not understand this error code: proxy: read response failed from 127.0.0.1:9009 (localhost)
[Mon Oct 26 09:23:11 2009] [error] (70007)The timeout specified has expired: ajp_ilink_receive() can't receive header

The Tomcat catalina.out log is clean.

When I run a netstat, it's full of CLOSE_WAITs on port 9009.

Restarting Apache and Tomcat make no difference.

Server is SLES 10 SP2 with OES2 SP1, all patches up-to-date.

Apache and Tomcat are the versions installed by the SLES install.

Any ideas?