I have a sbs2003r2 server which was created by a lengthly process of upgrading a nt4 domain and migrating all roles across and then removing the old server.
All the FSMO roles and dns are correct.
It is operating in native 2000 mode.
I have applied SP2 although not any furthur updated as it doesnt have internet access currently.
It has been activated.
I now have a server 2003R2 member server with SP2 and all the current security updates applied.
It is configured to use the correct dns server.
I tried running dcpromo to turn it into a secondary domain controller but it complains that the version of active directory on the master is incompatible and that I should run adprep on the sbs server to prepare the domain.
I ran adprep with the /forestprep and then the /domainprep options but it said that the changes had already been performed.
What do I need to do to fix it so I can add the computer as a domain controller?