The problem seems to be related to another instance of jboss-4.0.5 installed on another machine on the Lan... I've configured both jboss to isolate the system from each other as described here http://wiki.jboss.org/wiki/Wiki.jsp?page=TwoClustersSameNetwork. Both servers use "ports-1" configuration. Anyone can explain me how two jboss on the same lan, not configured in cluster, share the JMS service. Note that on the two jboss is deployed the same application (i.e. there are the same queues configured, maybe this is the problem?). thanks to all. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4014878#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...