When migrating an SBS 2003 box to Server 2012, when it runs through the migration wizard it displays the error

Cannot promote server as domain controller

Upon checking the logs and the Sites and Services it creates Domain Controller but the NTDS connector are missing

Upon checking the settings for the SBS 2003 box , the primary DNS server for the box had been set ( by another company ) to the Gateway/Router instead of itself ( Either 127.0.0.1 or the Local IP of the Server ). I’m not sure how the Domain had been working before hand , but after setting this to the correct value I retried the Wizard and the wizard ran through and completed successfully.