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Side-by-side Upgrade: Server 2012 R2 Foundation to Server 2025 Essentials
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?