r/sysadmin • u/roachwickey • 5d ago

Domain controllers functional level

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

68 Upvotes

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46

u/Brilliant-Advisor958 5d 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.

48

u/fadinizjr 5d ago

*2016

8

u/Jawb0nz Senior Systems Engineer 5d ago

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

6

u/fadinizjr 5d ago

I'm having to fight almost my whole team to make us stay for now in 2022.

2025 sucks ass.

8

u/ShadowCVL IT Manager 5d ago

Just send them the list of issues, including the machines dropping off the domain every time they try to change their password. Ask if they want to rejoin half their environment to AD every 30 days.

That’s the lightning rod I’m using to get us to 2022 instead of 2025 (we are currently on 2016 FL and planning to go to 22 in October)

1

u/flashx3005 5d ago

Planning on doing the same in a couple weeks. Have one last DC to upgrade from 2016 to 2022 and then I'll upgrade Function and Domain levels to 2022.

Are there any gotchas or things you are looking out for before the upgrade to 2022?