We have 3 NT Servers, we promoted 1 to PDC and then upgraded it to Windows 2000, everything at this point seemed to be working great (users and so on where all showing on W2000 and NT4 servers). Then, and this is the stupid bit, one of the 2 NT4 servers was promoted from BDC back to a PDC. So both NT machines now show the W2000 server as a BDC. This has caused a number of problems with sycronisation across the domain, we are having problems now getting DHCP to work correctly and RIS. Now here is the question.
How can we get our NT4 servers to think the W2000 server is the PDC, and both of them go back to being BDC's? if you promote the W2000 server from a NT machine you just get an error.