Port reservation

By default the NSS server uses TCP port 4159, but this value is configurable using the Port parameter of the NssConfig statement in the NSS server configuration file. For additional details about the NssConfig statement, see z/OS Communications Server: IP Configuration Reference.

Tip: Update the PORT statement in the TCP/IP profile to reserve the port that the NSS server will use when listening for client connections.

PORT
     4159 TCP NSSD