Ugh ... The solution to this problem was to specify the bind address to run.sh ./run.sh -c messaging-node0 -b 0.0.0.0 I guess by default, it just binds to localhost ... Even though the cluster stuff appeared to be starting up, and I could see members being added to TreeCache, I guess it really wasn't It would be really helpful if this tip was called out in the configuration docs ... I stumbled across this post which mentioned the -b parameter http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4071554#... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4076511#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...