Please send me the logs showing the full startup that results in the error. What JGroups version are you testing against? AS is using 2.6.6.CR1 (2.6.6.GA will be released tomorrow); 2.6.5.GA is fine too. I don't know of any reason why an fairly recent earlier version would give you trouble though. I'll post separately about the differences between your r4985 and r5284. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4187153#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...