Also, the remoting client pool size by default is 50 concurrent connections, and these will timeout after a while (this is what you are seeing). If your mySQL instance is slow, then you may have a lot of invocations backing up (remember you have 500 sessions - this is a lot) waiting to get one of those 50 from the pool, since they're taking significant time to execute. You could try increasing the remoting client pool size to a value higher than 50. In remoting-service.xml for the socket connector add an attribute and try a higher value. | <attribute name="clientMaxPoolSize">100</attribute> | I will also update the code so it clears up better after a failure so as not to give you the knock on IllegalStateException. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4017573#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...