I have executed one perfSender/perfListener like this: ant perfSender -Dsess.trans=true ant perfListener -Dsess.ackmode=AUTO_ACK (notice: this is NonPersistent) In about 1 in 10 tries.. I'm not getting all the messages on the listener. I was having problems with messages not being deleted on the journal, then I decided to do a test without persistent and I'm still loosing messages. Probably messages are sent Asynchronously and something is ignoring an eventual socket error? This is something to be investigated. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4167407#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...