The TCP listening port for the iSCSI host ports is the port number that the controller uses to listen for iSCSI logins from host iSCSI initiators.
The TCP listening port for the iSNS server is the port number that the controller uses to connect to an iSNS server. This process lets the iSNS server register the iSCSI target and the iSCSI portals of the storage subsystem so that the host initiators can find the storage subsystem.