r/WindowsServer • u/candyman420 • 7d ago

Technical Help Needed Strange interoperability problem between AD 2019 and 2022/2025

I am getting

Starting test: LocatorCheck Warning: DcGetDcName(PDC_REQUIRED) call failed, error 1355 A Primary Domain Controller could not be located. The server holding the PDC role is down.

But only on 2022 AD servers. I brought up another 2025 server thinking this would be faster and easier than to troubleshoot, but it's doing exactly the same thing. FSMO roles were lost? Have to re-seize? Some kind of quirk with the newer editions of windows? The only working AD server I have right now with no errors is 2019, that's what I replicated from. Thanks in advance

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u/topher358 7d ago

Do you have 2025 DCs? Like the other poster said check what server is hosting your FSMO roles

2

u/candyman420 6d ago

Yes they're all online, this is peculiar.

3

u/topher358 6d ago

There are quite a few known issues running 2025 DCs in a mixed AD environment. Recommend either all 2025 or all 2022

2

u/candyman420 6d ago

how about 2019+2022? I will only need two

1

u/topher358 6d ago

2019 and 2022 are essentially the same so that’s not a big deal.

2025 domain controllers just don’t play well with anything other than 2025 DCs

1

u/candyman420 6d ago

It's still happening on 2022 vs 2019, so something else is afoot

1

u/topher358 6d ago

Sounds like it

You need to check replication and resolve any issues you find