need help: the example LEDSwitch Client did not work correctly

the example LEDSwitch Client for MCB2300 did not work correctly in my MCB2378 board.it can be ping,but i can not connect to it by TCPServer.

   switch (protocol) {
      case TCP:
         socket_tcp = tcp_get_socket (TCP_TYPE_CLIENT, 0, 10, tcp_callback);
                 if (socket_tcp != 0)
                 { tcp_connect (socket_tcp, Rem_IP, PORT_NUM, 0);}
         break;

while (1) {
      timer_poll ();
      main_TcpNet ();
}

can you send me a new one! thanks!