- Are the 3 additional boxes in the same subnet as the others ? - Do they bind to correct addresses ? 127.0.0.1 is *not* one ! - Any firewalls on ? If so, turn off to see whether the JOIN is successful - Do you use VLANs ? If so, the 3 additional boxes need to be in the same VLAN as the others. Make sure VLANs dont drop IP multicast packets - If nothing else works, you can always fallback to TCP:TCPPING and - list your 6 nodes in TCPPING explicitly View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4100991#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...