Another note -- if you are upgrading an NT 4.0 PDC/BDC you will want to make sure that the FQDN of the NT 4.0 machine is either blank or matches what you are going to call the Active Directory.
For example, in Windows NT 4.0 domain you had a FQDN of MyCorp.com and the new AD is going to be called MyCompany.com. If you upgrade the NT 4.0 server as it is, the system will name the AD MyCompany.com as instructed but WILL NOT rename the FQDN of the server, so it remains server.MyCorp.com.
Since it is a DC, you cannot rename the domain OR the FQDN of the server. Since the AD and the FQDN of the DC do not match, NO server will be able to locate or authenticate against these machines. You will end up reinstalling.
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