I'm trying to finish virtualizing my environment, and I've hit a snag that I can't seem to get through. My old server is a Windows 2003 R2 box that runs Active Directory and also has Exchange 2007 on it. It's functional levels are set at 2003.
I have created a new mail server which is working, and everything we have is pointed at this new Server 2012 box with Exchange 2013 installed. Mail works, and there are no issues with the co-existence we currently have, but the goal is to remove that 2003 AD/Exchange 2007 Server.
I have also build a new domain controller, Server 2012 box. I have transferred my roles to it without a hitch, and whenever I add a new employee to AD in the old AD server, I can see them show up within seconds on the 2012 box, so on some levels, I know replication is working.
However, when I go into my Server 2003 box, or do this step from the 2012 box, when I turn off the Global Catalog on the 2003 box, chaos ensues. Once I do that, which leaves Global Catalog on only my new server, no one can log in. When I turn on GC again on the old unit, the problem goes away, and things are as they should be. Any ideas why this could be happening? I don't want to demote the 2003 server at this point, because logging in is a critical part of our users daily routines.
Some things I have noticed, is that the Sysvol and Netlogon folder won't replicate. DCDiag fails the advertising test, saying my new server isn't suitable, and also says my old server is the one advertising. It fails Netlogon test, stating it can't find the folder. And the test ends with group policy failures as well, probably all related.
