sir

 I have old server windows 2003 R2 configure  with active directory domain controller. I want to add existing domain controller a new server windows 2012 stander R2 .

I add existing domain controller in windows 2012 successfully.All users & group policy show in new server. Also i create new user in new server same user show in old server.

problem is when i disconnect my old DC server 2003. My new server AD showing cross & not show any user & group.

how to solve this problem