Hi Folks, sorry if this is a noob question but I am new to JBoss and digging the net for hours now and dont get the clue. I have an already running JBoss 4.2.3 GA running on Linux and now want to run more than one JBoss on this single box. As I have only one IP, I want to use individual port ranges for each instance. I successfully switched on the ServiceBindingManager and configured the Cluster-Service-Ports so they are different for both environments. If I call netstat, I can see both JBoss binding to UDP Port 7500. I was not successfull to find anything in the configs that explicitley uses this port. Google tolds me that this is the Diagnostic Port of JGroups - but all methods found to disable or move this port failed. However the servers seem to do their work but I am uncertain if there is any unwanted interaction between them. Any help is appreciated Oliver -- Protect your environment - close windows and adopt a penguin! PGP-Key: 3B2C 8095 A7DF 8BB5 2CFF 8168 CAB7 B0DD 3985 1721