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 Manager
After 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:
_kerberos
_ldap
Netlogon.dns
If 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:
_ldap._tcp.Domain_Name
Nslookup
Nslookup 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:
- On your DNS, click Start, and then click
Run.
- In the Open box, type
cmd.
- Type nslookup, and then press
ENTER.
- Type set type=all, and then press
ENTER.
- Type
_ldap._tcp.dc._msdcs.Domain_Name, where
Domain_Name is the name of your domain, and then
press ENTER.
Nslookup returns one or more SRV service location records that
appear in the following format, where
Server_Name is
the host name of a domain controller, and where
Domain_Name is the domain the domain controller
belongs to, and
Server_IP_Address is the domain
controller's Internet Protocol (IP) address:
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
REFERENCES
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: