This is getting frustrating. I checked the event log on the ESX box and it is telling me that "The Discovery target returned a login error of: 0301". The VMware help on this isn't much help because it says that there is a problem with the iSCSI host - either the array is offline or there is a problem with the port. I know that neither of those are true because I added a Windows 2012 box to the list of initiators allowed on the target and it was able to connect and disconnect at will. So, I added CHAP on the target but not on the ESX box just to see if the error changed (I figured that it should because it will now be failing a CHAP challenge). No change. Still the 0301 error. Plus, I checked the event logs on the target server and found nothing. Not even an audit failure in the security log which is what I expected. Just to be safe, I added the ESX box to Active Directory as well. Still nothing.
Bert