I still don't understand for every of the 2 jgroups stacks: a) what is the fixed TCP port used for (e.g. cluster-service.xml 49153), why it binds to 0.0.0.0, and how is configured b) what is the randomly chosen UDP port shown as bound to 0.0.0.0:nnnn (is this the bind_addr you are talking about? is it a Unicast server socket? If so, should't this bind to the jboss.bind.address?) As a side note, properties like 'ignore.bind.address' should really have an indication of what subsystem they target, e.g. 'jgroups.ignore.bind.address' View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3963123#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...