Error message: The wizard cannot gain access to the list of domains in the forest

When you attempt to use Dcpromo.exe to move a Windows 2000-based, or a Windows Server 2003-based server into an existing domain, the following error message may be displayed: If you are using Windows Server 2008, the error message may resemble the following:

This problem can occur if the server that is running the Domain Name System (DNS) service has not registered an "A" record for itself in DNS.

The SRV records for the domain controllers must be in the DNS database. If the "A" record for the DNS server is missing, the process does not succeed.

You can add the "A" record to DNS by issuing the following command at the DNS server: After verifying that an "A" record is present for the DNS server, you may receive the following error message when you attempt to continue the Dcpromo.exe process:
To resolve this problem, type the following command on the server on which you try to use Dcpromo.exe. This command clears the DNS resolver cache on the computer that is running Dcpromo.exe so that it re-creates the query after the "A" record for the DNS server is registered in the DNS database. This problem can also occur during the Dcpromo.exe process if the existing domain controller that is authenticating this process does not have file and printer sharing enabled on its network adapter. To resolve this issue, enable file and printer sharing on the existing domain controller until the Dcpromo.exe process is complete.