One issue I am observing when we use secure messageing in jboss is as follows. Associate a role (e.g. foo) with a queue. Associate a user with that role (e.g. john) with the mdb that is listening to the queue. Now try to create connection using john as the user and publish to the queue - it fails - stating that the client id has already been established. Now try to create the connection using peter (another member of foo role) - it works. Is there an explanation for this? Why can't I use the same user in both the MDB that listens to the queue and also the client that publishes to the queue? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3967149#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...