We identified what was causing the problem. One of our consumers had an uncaught exception that was occasionally thrown in the MessageListener thread. By simply preventing this exception we no longer see the broker lock ups. Is this expected consumer behavior? It seems that the broker/server should be insulated against client problems. -- View this message in context: http://www.nabble.com/ActiveMQ-4.1.1-server-freezes-tp17104702s2354p17189972.html Sent from the ActiveMQ - User mailing list archive at Nabble.com.