The VTrak 15200 requires Microsoft iSCSI initiator v1.06. This is the only Microsoft iSCSI initiator that will mount the VTrak.
New v2.x initiators, like those available now from Microsoft, are not compatible. The 2.x initiator will not let the VTrak mount.
You must use Microsoft iSCSI initiator v1.06 with the VTrak 15200.
Initiator 1.06 is download is attached to this KB article.