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Some Domain Controller concerns

Recently I had a strange situation where one of my DCs didn't have a current copy of Group Policy objects so PCs authenticating to it didn't behave as expected. Took me some time to figure it out. I restarted the problematic DC (and after that, 2 others) and everything went back to normal.
Now I have a folder:
on 2 of my 3 DCs but afaik, everything is replicating properly.

I could not find a reason for it yet.

What should I do ?

Also, I did dns check and everything is fine but I have some warnings related to missing AAAA records for domain controllers. Should I just ignore it ? I don't really want to disable ipv6 as I read a lot conflicting advices - some people say disable, some - do not.

DNSDomain Controller

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Steve Knight

8/22/2022 - Mon