We are also facing this same problem. I've configured/running the JBoss instance as said in the manual/WIKI. When I run the two nodes in the same system (scenario 3 in the manual), two nodes are coming into cluster and session is being replicated. But when I run the nodes in two different systems, nodes are coming into cluster but session is not being replicated. With this all I can suspect in my config is the value for -u (multicast address for UDP). I m using 239.255.100.100 (as mentioned in the manual). Is this fixed one or varies with network. If varies, how I'll get to know which one is for my network? Thanks in advance, Kanta View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4257825#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...