So this weekend I was starting the refresh of my home setup, removing all the Windows 2008 servers and replacing them with Windows 2012 servers, the first old Domain controller went fine, but the 2008 R2 DC would not run DCPromo correctly to demote the server out of the domain.
All the FSMO roles had been moved to the replacement servers but on running dcpromo i go the message "Directory Service is missing mandatory configuration information...unable to determine ownership of floating single-master operation roles"
This directed me to http://support.microsoft.com/kb/949257 which did not seem to be a solution, but did fix the solution. This does seem to show a potental issue with Active Directory that the Infrastructure master FSMO role is stored in both the domain configuration and the DNS zones, As such it is probably worth checking any forest/domain where the original Domain controller has been removed to confirm if the DNS zones have also been updated.
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