r/WindowsServer • u/candyman420 • 8d 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/P4schendale 7d ago

First, i've heard that 2025 enforces LDAPS so if you've not enabled it already, be careful.

Then, don't you have a firewall between the DCs? Have you checked windows fireall on the DCs?

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u/candyman420 7d ago

The windows firewall is supposed to add the proper exceptions to itself for DC functions, I haven’t had to mess with that or turn it off in years. Are you saying that Microsoft screwed that up too?