To verify A resource records exist in DNS

Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

Open Command Prompt.
Type:

nslookupRootServerIPAddress
Type:

nslookup
At the next prompt, type:

set q=A
At the next prompt, type the name of a domain controller.
Look through the returned resource records for the fully qualified domain name (FQDN) of the domain controller.

If they do not exist, do one of the following:
- If the zone authoritative for the Domain Name System (DNS) name of the domain controller is configured to allow dynamic update, use the ipconfig/registerdns command to renew DNS registration. This procedure must be performed from the command line on the domain controller that did not register its A resource record.
- If the zone authoritative for the DNS name of the domain controller is not configured to allow dynamic updates, on a DNS server, use the DNS console in Microsoft Management Console (MMC) to administer the DNS server and add the required A resource records or enable dynamic update.

Value	Description
nslookup	Initiates the command-line tool.
RootServerIPAddress	The IP address of a valid root server.
set q=A	Sets the resource record type to address (A) in the query to the root server.

Notes

To open a command prompt, click Start, point to All programs, point to Accessories, and then click Command prompt.
To view the complete syntax for this command, at a command prompt, do the following:

Type nslookup, press ENTER, then type help.

Information about functional differences

Your server might function differently based on the version and edition of the operating system that is installed, your account permissions, and your menu settings. For more information, see Viewing Help on the Web.