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I have removed the Domain Controller role from my Windows Server 2008 R2. Now I cannot login remotely any more with the Administrator account, neither using the username "\Administrator", nor "Administrator".

Does anyone know how to get onto this server now?

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Have you tried <COMPUTER-NAME>\administrator? Do you only have remote access to the machine? – iainlbc Oct 23 '11 at 17:22
Yes, I only have remote access to the machine but my data center provider offers something like a remote VGA access. Do you think this could help me further? – Heinrich Oct 23 '11 at 17:25
I have tried COMPUTER-NAME\Administrator, without success. – Heinrich Oct 23 '11 at 17:25
Time for Disaster Recovery... – mailq Oct 23 '11 at 17:43
up vote 3 down vote accepted

If the machine is still a member of a domain (i.e. if you did not remove the last and only DC from the domain), you should be able to log in with DOMAIN\administrator and the domainadmin credentials.

If it was the last DC of a domain or you can't use the domain admin account for some other reason, you need to use the "MACHINE\Administrator" user and the password you've specified for "Directory Service Recovery Mode" during promotion.

If this password is lost, reset it by using a ntpasswd boot disk or live CD and try again.

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Works, even when only using \Administrator. Thanks! – Heinrich Oct 23 '11 at 18:19

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