Thank you very much for replying. I patched the method as follows : protected void verifyNodeIsUnique (Vector javaGroupIpAddresses) throws Exception | { | byte[] localUniqueName = this.localJGAddress.getAdditionalData(); | if (localUniqueName == null){ | log.warn("No additional information has been found in the JavaGroup address: " + | "make sure you are running with a correct version of JGroups and that the protocol " + | " you are using supports the 'additionalData' behaviour"); | //path issue JBAS-4202 - http://jira.jboss.com/jira/browse/JBAS-4202 | return; | } else { | for (int i = 0; i < javaGroupIpAddresses.size(); i++) | { | IpAddress address = (IpAddress) javaGroupIpAddresses.elementAt(i); | if (!address.equals(this.localJGAddress)) | { | if (localUniqueName.equals(address.getAdditionalData())) | throw new Exception ("Local node removed from cluster (" + this.localJGAddress + "): another node (" + address + ") publicizing the same name was already there"); | } | } | } | } This is working fine. When may we expect the real fix from you guys? Just another question : in my firewall's I only should open the GossipRouter port... correct? Thanks for helping me out. Johan View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4027707#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...