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I cannot Promote 2003 DC to a 2000 Domain

When running DCPROMO I get an error that says:

"The version of the Active Directory schema on the source forest is not compatible with the version of AD on this computer"

It gives this error after it says it is examining an existing forest.

We have run ADPREP for the domain and forest on the 2000 machine and it did not give any errors.

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1 Solution
Lee W, MVPTechnology and Business Process AdvisorCommented:
I would check your DNS settings first and ask how long ago you ran AD prep and how many other DCs you have.

If you ran the adprep commands as required, then DNS could be off on something preventing the preps from replicating to other DCs or preventing the new 2003 server from locating the appropriate DCs, or perhaps you have just done this on one DC and the 2003 system is attempting to validate with another DC that hasn't replicated the changes yet.
Lee W, MVPTechnology and Business Process AdvisorCommented:
Review my links - especially the onse from the Commodore.ca site below...

Common Mistakes When Upgrading a Windows 2000 Domain To a Windows 2003 Domain

Hotfixes to install before you run adprep /Forestprep on a Windows 2000 domain controller to prepare the Forest and domains for the addition of Windows Server 2003-based domain controllers

Commodore.ca | Windows | How To Upgrade Windows 2000 Domain to Windows 2003 Server
Quote from the top of this article: "Several glossy Microsoft presenters have stated that all you need to do to complete a Windows 2003 Domain upgrade is run ADPREP and then upgrade away.  This may work for very small / simple environments but it is definitely not good advice for most companies.  After upgrading five servers in two unrelated domains and installing many fresh copies of 2003 I can say that I personally would not skip a single step in the process I have developed below."

How can I transfer some or all of the FSMO Roles from one DC to another?

How To Create or Move a Global Catalog in Windows 2000

[If you run Exchange 2000] Windows Server 2003 adprep /forestprep Command Causes Mangled Attributes in Windows 2000 Forests That Contain Exchange 2000 Servers

Windows Server 2003 Upgrade Assistance Center
Let me guess: it's W2k3 R2? Installing R2 as DC requires another adprep /forestprep from the \cmpnents\R2\adprep folder on the second R2 CD.
Check this document for details:
Extending Your Active Directory Schema for New Features in Windows Server 2003 R2
lttechAuthor Commented:
oBdA you saved our lives.  I actually found the answer somewhere else but you answered what I needed and it was in a great time frame.  Hopefully someone else sees this thread down the road with R2!  

This was the only glitch in our migration....That 2nd CD was a life saver! haha

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