Two years ago, we upgraded all the domain controllers in our multiple domain, multiple site Active Directory from Windows 2000 to Windows 2008.
The forest consists of a root and a child domain, spread across two sites. Each site has 2 domain controllers in each domain, and DNS is only integrated into the forest root domain.
I was able to successfully raise the Domain Functional levels of both domains to Windows 2008. However, I am unable to raise the Forest Functional Level away from Windows 2000 (to either 2003 or 2008) - every attempt gives Error "0x2024 the administrative limit for this request was exceeded"
I have attempted to run this from both the schema and the infrastructure master in the forest root (split to different domain controllers). I have tried running it with my account (member of Enterprise Admins and Schema Admins). I have tried running it with the (renamed) Administrator account. I have attempted to do it via the GUI using Active Directory Domains and Trusts, via Powershell on a Windows 2008 R2 domain controller (set-adforestmode), and I have even attempted to make the change using LDP.exe.
Every attempt, in every combination, yields the same "administrative limit exceeded" error. There are no logs that I can find (and there is no "save as" button, which some MS articles have alluded to). I've got nothing but a headache, and have been completely unable to find anything in Google.
Any help is greatly appreciated!