I'm getting this error:
"Verification of replica failed. The forest functional level is Windows 2000. To install Windows Server 2012 domain or domain controller, the forest functional level must be Windows Server 2003."
My forest level is set at 2008R2, per AD Domains and Trusts (on both the 08 servers and 2012). The forest was set at 2003 before, so I demoted the old 2003 server and raised it to 2008 with no luck, then went ahead and went to 2008R2.
The 2012 server (clean install, no upgrades) is already a member of the domain.
adprep /forestprep reports "forest wide information has already been updated"
Connectivity seems to be fine (ping, no firewalls) between the 2 08R2 DCs and the new 2012 server. Weird thing is all the AD tools are installed in 2012, and I can even create new domain users from it.