What is the operating system? I've found on some - particularly ESX, if this is the first time that port has been presented to a Hitachi box , it expects to see a LUN or it doesn't login properly. I always now manually create a host groups , present a lun , then zone in.
If it is the case of a first time in this instance, create the host group and present a lUN , no you need to do an flogi , either by rebooting the host or disable/enabling the switch ports for that host or the switch ports for those storage ports you're presenting on