Article ID: 816587 - View products that this article applies to.
For a Microsoft Windows 2000 version of this article, see 241515
This article describes how to verify Service Location (SRV) locator resource records for a domain controller after you install the Active Directory directory service.
The SRV record is a Domain Name System (DNS) resource record that is used to identify computers that host specific services. SRV resource records are used to locate domain controllers for Active Directory. To verify SRV locator resource records for a domain controller, use one of the following methods.
DNS ManagerAfter you install Active Directory on a server running the Microsoft DNS service, you can use the DNS Management Console to verify that the appropriate zones and resource records are created for each DNS zone.
Active Directory creates its SRV records in the following folders, where Domain_Name is the name of your domain:
Forward Lookup Zones/Domain_Name/_msdcs/dc/_sites/Default-First-Site-Name/_tcp Forward Lookup Zones/Domain_Name/_msdcs/dc/_tcp
In these locations, an SRV record should appear for the following services:
Netlogon.dnsIf you are using non-Microsoft DNS servers to support Active Directory, you can verify SRV locator resource records by viewing Netlogon.dns. Netlogon.dns is located in the %systemroot%\System32\Config folder. You can use a text editor, such as Microsoft Notepad, to view this file.
The first record in the file is the domain controller's Lightweight Directory Access Protocol (LDAP) SRV record. This record should appear similar to the following:
NslookupNslookup is a command-line tool that displays information you can use to diagnose Domain Name System (DNS) infrastructure.
To use Nslookup to verify the SRV records, follow these steps:
Server: localhost Address: 127.0.0.1 _ldap._tcp.dc._msdcs.Domain_Name SRV service location: priority = 0 weight = 100 port = 389 srv hostname = Server_Name.Domain_NameServer_Name.Domain_Name internet address = Server_IP_Address
For more information about the SRV records that are registered by Netlogon, please see the "SRV Records Registered by NetLogon" section in the TechNet document How DNS Support for Active Directory Works. To view this document, visit the following Microsoft web site:
Article ID: 816587 - Last Review: December 3, 2007 - Revision: 7.4