How to migrate from 2008R2 to 2012R2?

Question

Active Directory

Hello. There is a server with deployed AD, DNS, DHCP. Requires migration to 2012R2. I am doing the migration as described here. Everything ends well. I import DHCP and I authorize it. However, the new server does not fulfill its role. By disabling the old one and wanting to view the AD settings - AD indicates the absence of a server. Machines are also not entered into the domain, saying that there is no domain controller. However, a new server is set in the domain controller settings.
Please tell me what mistakes did I make?

Answer 1

Have you transferred FSMO to a new server? And then they put out the old one ..

Answer 2

Have you moved DNS yet? Previous question How to migrate dns server from winserv 2008r2 to 2012r2? Do you have any role not transferred?

Answer 3

Do an in-place upgrade and that's it.