We have an issue it is a little odd, we are running two instances of JBOSS clustering on two Red Hat Linux instrances, using VM ware (on same machine), this is for testing and replicating a live environment that has two teirs (fw in between) We are having trouble starting jboss in a clustered configuration, as it needs to have this, the errors seems to relate to not being able to send (broadcast?) to UDP sockets. The error is below I am pretty sure it isn't the firewall, but some permissions error. We can run unclustered, but JBOSS wont start in clustered mode PS this is the error we recieve 17:59:54,869 ERROR [UDP] exception sending msg: java.lang.Exception: dest=/229.1.2.3:45551 (83 bytes) java.io.IOException: Operation not permitted at java.net.PlainDatagramSocketImpl.send(Native Method) at java.net.DatagramSocket.send(DatagramSocket.java:612) at org.jgroups.protocols.UDP._send(UDP.java:316) at org.jgroups.protocols.UDP.sendToAllMembers(UDP.java:286) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4031284#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...