I did more analysis and it looks like after back end nodes detects one of the node is down it re-elects the master (after calling ElectionPolicy), after that jboss just pauses, it just halts. Could there be a bug with how Proxy stub at Front end box is not able to make the remote call and just hangs? I am just wondering why would rebooting one box cause all other boxes to hang and why would EJB call not round robin in this case. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4198962#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...