Remote Desktop - Your credentials did not work.

We have three Windows 7 machines in the office that are dedicated to Remote Desktop for all office staff. As of the last 2 weeks, two of the three machines have been increasingly denying RDP login to domain users, presenting the following message: Your credentials did not work. (See the image below.) Some details:

I'm seeing no evidence of the failed logins in the Security Log or System Log on the RDP machines.
Domain administrators are affected less with the failed login than users who are simply Local Administrators on the RDP machines, but periodically they see the failed login as well. All domain user accounts that fail to login to RDP machines 1 and 2 can login without issue on the third RDP machine.
This detail is bizarre: If I use the office server as an RDP client with any domain user account, the login simply works. Additionally, if I successfully login using the server as a client for User X, then I can resume using other machines in the office as clients for User X (client machines that had previously failed to login with User X.). It's as if the server RDP login "cleans the pipes" for User X.
Finally, the two machines are configured for multiple concurrent RDP sessions. The following article provides a nice summary of the configuration. http://www.serverwatch.com/server-tutorials/how-to-enable-concurrent-remote-desktop-sessions-in-windows.html It's possible that this is related to the issue.

Your credentials did not work.
jdanaAsked:
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KimputerCommented:
Please check you have the latest updates installed on all servers and clients. During this March Patch Tuesday there was a faulty patch that was only fixed this week with another out of band patch.
In case these problems appeared happened AFTER Patch Tuesday (and rebooting the servers), the solution is to update your servers and PC's again.
In case it is not related to updates (you skipped March updates?), then I have no clear answer as of this moment.
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NVITEnd-user supportCommented:
At least two updates involved were KB3002657 and KB3046049. As Kimputer stated, these have been reissued by now.

More info from Microsoft forum: https://social.technet.microsoft.com/Forums/en-US/0a520543-29d4-4466-9967-e39d819d11f1/users-cannot-log-into-remote-desktop-after-3112015-update?forum=smallbusinessserver
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jdanaAuthor Commented:
Thanks Guys,

Naive Question - If I simply run Windows Updates on the problematic Windows 7 RDP machines, will it automatically pull the repaired KB3002657 and KB3046049, or are more steps involved?

J
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KimputerCommented:
No, just update. That's all (though of course, also update the SERVERS). It actually DOESN'T PULL the updates, it just installs the security updates again, but minus the bugs.
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jdanaAuthor Commented:
Done (and apparently fully functional). Thanks again.

J
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jdanaAuthor Commented:
Perfecto
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NVITEnd-user supportCommented:
Glad you got that fixed, J.
That issue affected several users here on EE.
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