internal static void delPort(ChannelForwardedTCPIP c)
        {
            Session _session = null;

            try
            {
                _session = c.getSession();
            }
            catch (JSchException)
            {
                // session has been already down.
            }
            if (_session != null)
            {
                delPort(_session, c.rport);
            }
        }
 internal static void delPort(ChannelForwardedTCPIP c)
 {
     Session _session = null;
     try
     {
         _session = c.getSession();
     }
     catch (JSchException )
     {
         // session has been already down.
     }
     if (_session != null)
         delPort(_session, c.rport);
 }