Well i changed the multi cast address and port in default.xml file in JGroups/conf folder to other values on both machines like wise it was 228.8.8.8 i changed to 228.8.8.9.... But the error remained the same. 11:24:13,062 WARN [UDP] packet from 192.168.1.6:3324 has different version (12338) from ours (23). This may cause problems 11:24:13,062 ERROR [UDP] failed unmarshalling message java.io.EOFException at java.io.DataInputStream.readShort(DataInputStream.java:298) at org.jgroups.Message.readFrom(Message.java:624) at org.jgroups.protocols.TP.bufferToMessage(TP.java:982) at org.jgroups.protocols.TP.handleIncomingPacket(TP.java:838) at org.jgroups.protocols.TP.access$200(TP.java:44) at org.jgroups.protocols.TP$IncomingPacketHandler.run(TP.java:1290) at java.lang.Thread.run(Thread.java:619) "bstansberry(a)jboss.com" wrote : On your network you have a process using a different version of JGroups. Find that process and change its version to match yours, or change your multicast address and port so your channel doesn't see the packets from the other process. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4076587#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...