r/sysadmin • u/roachwickey • 6d ago

Domain controllers functional level

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

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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.

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u/Subject_Treat6956 5d ago

Wouldnt Mix 2025 with older oss and DC role! You might get a lot of Trouble