I am attempting to add a 2008 server to an existing domain which is Server 2003 Standard.
When installing the Active Directory Domain Service Roll, this completes correctly. You are then advised that the server isn't running as a domain controller and you need to run dcpromo. When I run this, I select "existing forest" and "add a domain controller to an existing domain."
I then get a message that says "to install a domain controller into this AD domain, you must first prepare the domain using "adprep /domainprep"
It used to tell me to run "adprep /forestprep" which has been run correctly on the original 2003 DC.
When running "adprep /domainprep" on the 2003 DC, I get the message:
Adprep detected that the domain is not in native mode. AdPrep has stopped without making changes. Configure the domain to run in native mode and re-run domainprep.
Is is correct to "configure the domain to run in native mode" and if so...how?