I've found the problem. seems like i had to add a route net 224.0.0.0 netmask 240.0.0 and also had to add bind_addr="ip" in the tc5-cluster-service.xml. I only changed the cluster-service.xml and therefore it didn't work. So i changed the cluster-service.xml back to it's old values and added bind_addr in the tc5-clusterview.xml. Seems this is necessary on my linux machines View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4027578#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...