I have 3 DC's. All 3 are GC's, All 3 are VM's. 2 run server 03 standard and are seconardy DC's and the PDC/FSMO holder runs Server 08R2. I was having FRS replication issues with a seconadry DC and ended up running dcpromo to demote it, rebooted and then promoted it back as a DC/GC. All went well. I then decided to reboot the other two DC's for good measure and now I can no longer log into the PDC. I can ping it via IP and by DNS name. I can RDP to it, but all login attempts result in a "The user name or password is incorrect"
I know it has to do with DNS. The PDC has a red x on it in the DNS console of the secondary and it states tha tit's unable to connect.