Local tunneling question

Hi,
I'm trying to use the latest release of sshtools to create a local SSH 
tunnel to tunnel VNC.  (I know the SSHTerm has a VNC feature, but I 
would like to use sshtool to simply create a SSH tunnel and then use 
another VNC viewer application through this tunnel.)

So I wrote a small java app that simply creates a local forwarding 
tunnel, as shown below:

      SshClient ssh = null;
      ssh = new SshClient();
    // Connect and authenticate (GSI)
      ssh.connect(connectionProps, new 
DialogKnownHostsKeyVerification(null));
      SshAuthenticationClient authClient = new GSSAuthenticationClient();
      authClient.setHostname(connectionProps.getHost());
      authClient.setUsername("");  // Use empty username, GSI will set 
the usename to use.
      authClient.setProperties(connectionProps);
      int result = ssh.authenticate(authClient, connectionProps.getHost());
      if(result != AuthenticationProtocolState.COMPLETE)
      {
        JOptionPane.showMessageDialog(null,
          "Authentication error when creating VNC channel.",
          "", JOptionPane.WARNING_MESSAGE);
        System.exit(1);
      }
     
      // Create a tunnel for the VNC traffic.
        ForwardingClient forwarding = ssh.getForwardingClient();
        forwarding.addLocalForwarding("VNC", "0.0.0.0", 5920, 
"localhost", 5920);
        forwarding.startLocalForwarding("VNC");
      System.out.println("VNC tunnel started.");
      
        // And also open a shell to see what's going on...
        SessionChannelClient session=ssh.openSessionChannel();
        if (!session.requestPseudoTerminal("vt100",80,24,0,0,""))
          System.out.println("Failed to allocate a pseudo terminal");
        if (session.startShell())
        {
          InputStream in=session.getInputStream();
          OutputStream out=session.getOutputStream();
          IOStreamConnector input=new IOStreamConnector(System.in,out);
          IOStreamConnector output=new IOStreamConnector(in,System.out);
          output.getState().waitForState(IOStreamConnectorState.CLOSED);
        }


My tightvnc server is listening on a.b.c:5920.

If I use the command-line vncviewer to directly access the VNC server 
listening on a.b.c:5920, everything works fine.  But when I try to use 
the tunnel created by the code above (by using the command: xvncviewer 
a.b.c::5920), the vncviewer hangs after the password prompt and the only 
output log I get on the vnc server side is:

    15/05/07 10:53:37 Got connection from client 127.0.0.1
 
I suspect I'm not setting up the ssh tunnel correctly...  Any ideas what 
I might be doing wrong?

Any information about this would be much appreciated.

Thanks,
    Andre



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