The iSCSI listening port is the TCP port number that the controller uses to listen for iSCSI logins from host . The default value for this listening port is 3260.
The iSNS server listening port is the TCP port number that the controller tries to connect to an server. This process lets the iSNS server register the storage subsystem with the iSCSI target and the iSCSI portals so that the host initiators can find the storage subsystem. The default value for this listening port is 3205.