I'm trying to set up the first server/DC in a new domain on a new forest. All I've done so far is install the server, and then run updates and set a static IP and then install AD DS and run DCpromo. Everything else is left as is.
As per Microsoft's instructions, I set the FQDN to mydomain.mycompany.com, and at the end of DCpromo (it also install DNS as it's the first server), I get the following error:
"DCpromo was unable to create a DNS delegation in the parent zone: mycompany.com. This is because you do not have permissions to do so, or because the zone is hosted on a server that does not run Windows. To ensure that the domain controller can be found by other computers on the network, you must create a DNS delegation in the parent zone for this domain. To do so, contact an administrator who is responsible for the DNS zone: mycompany.com
The RPC server is unavailable."
I have ensured that all RPC services are running, the Server service is running and, just to be on the safe side, set my network to private rather than public.
However, if I do it all again and set my FQDN to mydomain.local, everything works fine. So it has to be something to do with including mycompany.com. But I'm following Microsoft's guidelines, it's a new server/domain/forest and everything else is set to default options, so I'm not sure why I'm getting this message and how to resolve it?
I'm fairly new to setting up DCs, so thanks for your help in advance!