I have and existing Windows server standard 2003 domain. It is a single domain controller which has DNS and DHCP enabled. The server holds all FSMO roles. The functional level is 2003. I am trying to promote a 2012 server to a DC as well however I am getting this error: Verification of replica failed. Active directory domain controller for the domain XYZ could not be contacted. Ensure that you supplied the correct DNS domain name. I had no problem joining the server to the existing domain and I can ping the 2003 server by name and ip address. Not sure what is going on here. Please help. If you have suggestions of things to check , please be detailed. thanks.