I have 3 domain controllers on Windows Server 2019 Standard. I just set them up in a testbed environment that replicates the real world environment with IP addresses, inter-subnet router, etc.
They are each on one of 3 subnets that are routed together.
All DCs can ping the other 2.
All DCs can open fileshares on the other 2.
However, ONE DC cannot show ONE other DC in Server Manager-All Servers. It only shows itself and one other.
Trying to add the 3rd DC results in: No Items Found.
The other 2 DCs are showing all 3. So, the missing DC in one case seems to be an OK DC in the other case???
I've checked everything I can think to check and haven't been able to solve this.