Ok I have reslved my problem I use the "local" multicast address that is "224.0.0.1" and not "224.0.0.0" as I think before posting. A last, my mping configuration that works so that limits the clustering only to local machine applications is : <MPING timeout="3000" bind_to_all_interfaces="false" | mcast_addr="224.0.0.1" mcast_port="7500" ip_ttl="8" | num_initial_members="2" /> View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4165011#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...