"agohar" wrote : Please note that another cluster is already running on the same network with 5 servers in it and it works fine. and i am looking to run both of these clusters in parallel. | when you say you are trying to run both of these clusters in parallel do you want all servers to join the same cluster or not? if not, you must move them onto different subnets and/or perform the JGroups channel isolation configuration as per the appropriate wiki docs. you may also need to configure/create more than one partition. please provide more detail as to the design/architecture goal(s) of this cluster(s). it sounds like you have a complicated setup. also, are these horizontal or mixed (vertical + horz) clusters? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4179185#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...