There is no firewall on my environment. When the JBOSS messaging server started , I do this test successfully. telnet 10.164.75.22 4457 After telnet , I input BACKSPCE on the telnet window , the JBOSS server show error : 11:22:59,155 ERROR [SocketServerInvoker] Failed to accept socket connection java.lang.reflect.InvocationTargetException at jrockit.reflect.NativeConstructorInvoker.newInstance([Ljava.lang.Object;)Ljava.lang.Object;(Unknown Source) at java.lang.reflect.Constructor.newInstance([Ljava.lang.Object;I)Ljava.lang.Object;(Unknown Source) at org.jboss.remoting.transport.socket.ServerThread.createServerSocket(ServerThread.java:202) at org.jboss.remoting.transport.socket.ServerThread.(ServerThread.java:99) at org.jboss.remoting.transport.socket.SocketServerInvoker.processInvocation(SocketServerInvoker.java:497) at org.jboss.remoting.transport.socket.SocketServerInvoker.run(SocketServerInvoker.java:450) at java.lang.Thread.run()V(Unknown Source) Caused by: java.io.IOException: Mismatch version of JBossSerialization signature at org.jboss.serial.io.JBossObjectInputStream.checkSignature(JBossObjectInputStream.java:113) at org.jboss.serial.io.JBossObjectInputStream.(JBossObjectInputStream.java:94) at org.jboss.remoting.serialization.impl.jboss.JBossSerializationManager.createInput(JBossSerializationManager.java:59) at org.jboss.remoting.transport.socket.ServerSocketWrapper.createInputStream(ServerSocketWrapper.java:56) at org.jboss.remoting.transport.socket.ClientSocketWrapper.createStreams(ClientSocketWrapper.java:76) at org.jboss.remoting.transport.socket.ClientSocketWrapper.(ClientSocketWrapper.java:54) at org.jboss.remoting.transport.socket.ServerSocketWrapper.(ServerSocketWrapper.java:50) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3987459#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...