There are multiple JGroups channels running in your AS, each for different services. You need to be sure they are isolated from each other. See http://wiki.jboss.org/wiki/Wiki.jsp?page=TwoClustersSameNetwork .
Thank for the reply. The info on the wiki page was very helpful.
My problem was that I was setting both the jboss.partition.updGroup and jboss.partition.udpPort at the same time, as described at the bottom of the wiki.
Thanks for your help.
Finally I can post
I'm having same issue here with my clustered env. I read the wiki (http://wiki.jboss.org/wiki/Wiki.jsp?page=TwoClustersSameNetwork ), but to me, change mcast and port for each Jboss instance causes me so much trouble also for maintenaince too.
My question: Is there another way to solve this mcast port problem, or Is change them the only solution?