Forum Discussion
Side-by-side Upgrade: Server 2012 R2 Foundation to Server 2025 Essentials
Thanks, kyazaferr, for your reply.
Does it make sense to migrate to an intermediate Server 2019, that is, to first migrate Server 2012 R2 to Server 2019 and then Server 2019 to Server 2025?
It does not actually. You can migrate straight to a new version. Just be careful about the April update which enforce by default the AES encryption by default.
Good luck .
Thanks Mister_K for yor reply.
I'm asking because when i try to promote ther Server 2025 to Domain Controller it's says "Verification of replica failed. The forest functional level is not supported. To install a Windows Server 2025 domain or domain controller, the forest functional level must be Windows Server 2016 or higher."
Hello ,
Indeed, there's a requirement : You need at least to have a functional level at 2016 to integrate a 2025 WS domain controller . You have to promote the forest functional level first. Then, promote your Windows Server (WS) 2025 as a Domain Controller.
Before to raise the functional level, audit your Active Directory and the objects (applications, etc etc...) to make sure , it will be fine.
Best.
So, I do have to migrate Server 2012 R2 to Server 2019 before, because i can't raise forest functional level to Server 2016 on the Server 2012 R2, right?