Hi, we have solved the problem for us now. We've been trying different combinations of JBoss and JGroups, and found that it works in the combination of JBoss 4.0.4 and JGroups 2.2.9. Alternatively, what also seems to work is JBoss 4.0.5 and JGroups 2.4. So I assume it is a bug in JGroups 2.2.7, which shipped with JBoss 4.0.4. Greetings Martin View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3985873#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...