What do you see in the console window that tells you there are two members? Are you sure it's not logging from the JGroups channel that's running from cluster-service.xml? There's no difference in behavior in the cache's member attribute between a TCP config and a UDP config -- the cache knows nothing about the config; that's a JGroups detail. So if the member attribute is showing 2 members with UDP, that tells me that with TCP your caches aren't forming a cluster. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3982776#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...