Hiya Tim. The server side issue is with Messaging :-) The ServerSessionEndpoint code contains an executor for each instance. Unfortunately nothing shuts down the executor which means that the threads created by the executor are never destroyed. I modified the messaging code to include a call to executor.shutdownNow() in ServerSessionEndpoint.close() and this appears to have done the trick. Kurt's test is now up to 40000 iterations and the client/server look stable. I'll give it a longer run over the next day or so. Kev View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4027003#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...