From what you described it sounds like broken DNS, but dcdiag reports DNS is functional. I'd also check that all members (including domain controller) got the domain network profile.
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I'm struggling with our server since last night when the MD updated Sage to a newer version and restarted the server (Server 2016).
Since then none of the PCs can access any information on the server however things like DHCP are working.
Errors on all client PCs: -
However, if run PortQryv2 on the IP address of the server it returns the DNS name (server in question controls DNS)
What PortQry does show is that the RPC Endpoint Mapper did not respond.
i.e.
IP address resolved to {servername}
querying...
TCP Port 135 (epmap service); LISTENING
Using ephemeral source port
Querying Endpoint Mapper Database....
Server's response:
RPC Endpoint Mapper did not respond
TCP port 135 is FILTERED
I've checked the server and RPC Endpoint Mapper and it is running however I can't change any settings on it.
-= Additional Edit =-
I had a new PC which I connected to the domain without issues, it accepted the user and created a record for the PC in the Active Directory
It then rebooted to complete the process but on logon it wouldn't sign on (cannot find domain errors)
It was left an half an hour and now it's starting to logon
It grabbed the policy settings, including the mapped drives at some point but now it has the same issue as all the other PCs with regards using the drives and taking GPO updates.
From what you described it sounds like broken DNS, but dcdiag reports DNS is functional. I'd also check that all members (including domain controller) got the domain network profile.
Cheers, it could well have been.
I bit the bullet and re-installed Server 2016 before I fell into the pit of doom.
Everything working fine since re-install, issue started to return once I tried to re-add bit-defender so that's staying off for now.