I am trying to setup a child domain. My current domain is ad.doamin.com. I would like to create eos.ad.domain.com. I have all the right DNS setup. I have a local DNS server with a forward to the DNS server that provides name resolution for ad.domain.com. It does support dynamic updates and passes the DNS diagnostics during DCPROMO. I get all the way through the wizard and it starts to do the creation. It hits a point where it is examing the current forest and I get this error.
"The operation failed because:
Active directory could not determine if the domain name DC=EOS,DC=AD,DC=domain,DC=com is unique on the remote domain controller dc.ad.domain.com. If this name is not unique, rename the domaon.
The system cannot find the file specified."
I have tried using different names for the child domain but nothing works. Please help.