I recommend to replace JGroups 2.2.7 which is shipped with 4.0.3, with 2.4.1 View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4016708#4016708 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4016708