This parameter should be left blank or omitted except in special circumstances.

The IpScpiPort key is used to specify the IP SCPI port of a device. This is the TCP/IP port used to communicate to the device  The default PNA SCPI port is 5025 and does not need to be changed except in very circumstances where this port number is blocked on a specific network segment. To utilize a different port number requires special firmware on the PNA.

For further information see Keysight Documentation