Hi Michael,
my difficulty is to understand where you see the 'request timed out" :(
the logfiles can be found in JBOSS/server/your-config-name/log/server.log
You might look for WARN/ERROR if this problem raise. If it is a JBoss problem then you should see somthing like this.
But I suppose it is something application related, so it will be interesting where you see the time out message.