First, did you change the binding.xml file other that the one line you listed? Second, if you do not bring up the first JBoss AS instance, and only bring up the second, do you still get the same error? If so, something else is using that port, or preventing you from opening that port (firewall?) Third, you don't need to change the bindings.xml file at all, you can choose which binding config to use like this: ./run/sh -c xxx -D-Djboss.service.binding.set=ports-01 If you don't want to type this all the time, create another script containing the above line (that's what I usually do if I need to run multiple instances) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4204382#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...