Take a look at your jboss-messaging.sar/messaging-server.xml Each server must have a unique serverID: That is used by routers to redirect to the appropriate callback client. If both have the same ID, a client with two identical connections might get lost. anonymous wrote : | <!-- ServerPeerID --> | <<--- here | <!-- DefaultQueueJNDIContext --> | | <!-- DefaultTopicJNDIContext --> | | | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3984185#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...