This read-write object points to a Port WWN list in the vsanWwnListTable whose members are denied fabric login on this specific interface, with a value of zero meaning no WWNs are being denied on that port. An administrator uses this to block particular host or storage adapters from logging in through a specific port, adding a layer of per-interface access control beyond VSAN-wide WWN policy. For example, setting vsanIfDenyList to the index of a list containing a decommissioned server's WWN prevents that old adapter from logging into the fabric even if it is physically reconnected to this port.