1. Right-click My Computer, and then click Properties.

2. Click the Network Identification tab.

3. Compare the DNS suffix section of the full computer name to that of the domain name listing. The full computer name reads as follows: hostname. dns_suffix. These two entries should contain identical suffix information.

If these two entries do not contain identical suffix information, a disjointed DNS namespace exists. This condition prevents proper registration of any Active Directory DNS records.

Note: The only supported method to recover from a disjointed namespace is to use Dcpromo to remove the computer from the domain and make it a stand-alone server. You can then correct the DNS namespace information and run Dcpromo again to promote the computer back to a domain controller.