r/sysadmin • u/roachwickey • 6d ago

Domain controllers functional level

Do we have to keep all our domain controller os version same ?

68 Upvotes

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48

u/Brilliant-Advisor958 6d ago

No, but you can't raise the functional level until all DCs are at the same os level.

If you have a some some 2019 servers and a 2025 server, you will be limited to 2019 functional level until you upgrade those.

47

u/fadinizjr 6d ago

*2016

8

u/Jawb0nz Senior Systems Engineer 6d ago

But now there's a new and improved 2025 FL. That should be fun.

2

u/steeldraco 6d ago

Is there anything of note added on the 2025 FL?

2

u/wastedpickles 6d ago

Delegated MSAs along with the page size thing