The selected iSCSI subsystem supports only simple iSCSI target configuration, which provides automatic target management ...

The selected iSCSI subsystem supports only simple iSCSI target configuration, which provides automatic target management and LUN assignment. If you create a volume on the LUN and the iSCSI initiator is not logged on or is unable to use current credentials to log on to the iSCSI target to which the iSCSI subsystem assigns the LUN, it may not be possible to perform volume operations. If this is the case, you must manually log on to the iSCSI target, and then use Disk Management to create a volume.  Do you want to continue?