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Can't log Windows 10 into Windows Server 2012 R2 Essentials domain: Wrong user name or password

posted Oct 19, 2016, 6:35 PM by Brian Mattingly   [ updated Oct 19, 2016, 6:37 PM ]
No ... you are not going crazy. You just joined a Windows 10 Pro machine (that you in place upgraded from Home likely) to a Windows Server 2012 R2 Essentials domain. Joined just fine. Reboot. Try and login: Wrong username or password. 


If you are like me you try several known-good username / password combos lot's of times until you start to doubt your sanity. 

Silly you! It's Windows 10!!!

Here is the best thread I've found about the issue: 

The fix for me: Run the Windows 10 Media Creation Tool under a local admin account, "upgrade", reboot. Viola. 

Another (unproven to me) registry edit from safe mode ... no good for remote support: See attached PDF.  

Brian Mattingly,
Oct 19, 2016, 6:35 PM