Yes, you need to use the remoting jar that comes with 5.1. However, the best way to try is use AS 5.1. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4248171#4248171 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4248171