Windows 2012 refuses login of RDP users

A relatively new server has suddenly stopped allowing remote connections to logon - it goes as far as the RDP logon but rejects the connection stating the user/password are incorrect (they're definitely not) - local logon works fine, this was working up to last Friday but now I can't even logon via RDP using domain admin credentials.  Any suggestions please?
t38Asked:
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NVITCommented:
@t38

robinhornnz has isolated the updates: KB3002657 and KB3046049 and resolved it by removing them: http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/Windows_Server_2012/Q_28636661.html#a40671657
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Cliff GaliherCommented:
Open the services control panel and look for stopped services. There have been a few isolated incidents of odd interactions with patches and other updates the last two weeks that are leaving a couple of necessary services in a stopped state. Services failing to start will also write an event log entry so that's another place to look. Especially right after a reboot.
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t38Author Commented:
Thanks, I can't see any stopped services that might cause a problem like this - I've just tried to logon using local credentials and it works, it's just when trying to logon to a domain account that I get the problem...
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NVITCommented:
@t38
You may want to consider this.
JacobsIT claimed removed all March updates amd problem is fixed. http://www.experts-exchange.com/Software/System_Utilities/Remote_Access/Q_28635669.html
Unfortunately, the specific update/s was not stated.
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t38Author Commented:
Thanks, will check those out and revert..
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h1r0Commented:
You might want to verify the users are a member of the Remote Desktop users group on the session host (terminal server )
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