Start the appropriate servers to avoid trouble communicating over TCP/IP.
The system is shipped with several servers configured to automatically start when TCP/IP starts. However, you can configure additional servers to automatically start when TCP/IP starts, or you can manually start the individual servers at any time.
Remember that most subsystems required by your servers must be active before the server starts. However, some servers start their own subsystems. See the server table to understand how the servers map to the actual jobs and subsystems they represent.