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After I installed a fresh copy of Windows Server 2008 Standard Edition on a server and joined it to our domain, I wanted to promote it to be the second domain controller in our domain.

While trying to do so, I got the following error message: enter image description here

Does anyone have any ideas how to solve this?

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What's the OS and operational level of your primary DC (2000, 2003, 2008?) – tombull89 Dec 27 '11 at 11:30
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Is your first domain controller a Windows 2008 R2 system by any chance? If so then I'd suggest that the error message means what it says and says what it means. – DJ Pon3 Dec 27 '11 at 12:30
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Your are trying to promote a Windows Server 2008 (v6.0) server to Domain Controller of a Active Directory 2008 R2 (v6.1) deployment, the other Domain Controller(s) must be Server 2008 R2.

Server 2008 R2 is a completely new OS from Server 2008 (as much as Win7 is to Vista anyway). Despite the poor naming choice, which especially ignored that Server 2003 R2 was essentially a feature pack upgrade to Server 2003, they are not compatible in many ways.

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When you install 2008R2 you're given the option of selecting the version of Ad you want. If 2008R2 was selected then adding a 2008 non-R2 or older DC is simply not possible. Ever. – Multiverse IT Dec 27 '11 at 20:05
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