Another possible thing is your network not having UDP routes between these two servers. Take a look at logs if each server can find each other. I believe in an older version of JBM, the default JGroups configuration provided on JBM only set JGroups on localhost, but that should be fixed now. But anyway.. you should double check that also. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4135792#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...