nisd.port.tcp
This configuration parameter sets the TCP port number the adnisd process uses to create the socket for NIS client communications. For example, the following sets the TCP port to 2556:
nisd.port.tcp: 2556
By default, no port number is specified. If you do not specify the port number, the operating system assigns a random port number.
Use the nisd.port.udp and nisd.net_addr parameters to complete the NIS client socket configuration.