Okay, the following code below works: package org.jgroups.tests; import java.net.*; /** * @author Bela Ban * @version $Id$ */ public class bla { public static void main(String[] args) { try { int port = Integer.parseInt(args[0]); InetAddress interfaceAddress = InetAddress.getByName(args[1]); NetworkInterface networkInterface = NetworkInterface.getByInetAddress(interfaceAddress); InetAddress multicastAddress = InetAddress.getByName(args[2]); System.out.println("port = " + port + "\ninterface address = " + interfaceAddress + "\nnetwork interface = " + networkInterface + "\nmulticast address = " + multicastAddress); SocketAddress saddr; saddr=new InetSocketAddress(interfaceAddress, port); MulticastSocket socket = new MulticastSocket(saddr); socket.setInterface(interfaceAddress); socket.setNetworkInterface(networkInterface); socket.joinGroup(multicastAddress); Thread.sleep(600000); } catch (Exception e) { e.printStackTrace(); } } } View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3958314#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...