Our jboss5 clustering works fine,2 nodes can find each other,if jboss cluster uses UDP as well? I already confirmed with our network engineer,UDP was allowed on our testing Env,I will create a simple socket UDP application to verify this through. BTW,for connection factory look up,I wonder which one I should use, ConnectionFactory or XAConnectionFactory? I don't use transaction in the code. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4245423#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...