I have replaced my old 2000 DC with a 2003 DC. I have promoted my new 2012 server to a DC, have made it a global catalog and need to move all FSMO roles to the 2012 DC and take down the 2003 DC. For some reason, the 2003 DC can’t see the 2012 DC. I am unable to ping the 2012 DC from the 2003 server or any client pc’s. Temporarily, I turned off the firewall on the 2012 machine but still can’t see it on the network by hostname. I can ping it by IP address but not by hostname. DNS has replicated to the 2012 DC and DNS is working on the 2003 DC. I can’t even ping the 2012 DC from itself by hostname. What could be wrong ???????????????