The SRV record is a DNS resource record that is used to identify computers that host specific services, and is how domain controllers are located.

You can use DNS Manager on a domain controller that hosts DNS 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:

<Domain_Name>/Forward Lookup Zones/_msdcs
<Domain_Name>/dc/_sites/Default-First-Site-Name/_tcp
<Domain_Name>/Forward Lookup Zones/_msdcs
<Domain_Name>/dc/_tcp

In the above locations, a SRV record should exist for the _kerberos and _ldap services.

NOTE: For a non-Microsoft DNS server, open the %SystemRoot%\System32\Config\Netlogon.dns file in Notepad and verify that the first record is _ldap._tcp.<Domain_Name>

You can use the Nslookup tool:

1. On your DNS server, open a CMD prompt.

2. Type nslookup and press Enter.

3. Type set type=all and press Enter.

4. Type _ldap._tcp.dc._msdcs.<Domain_Name> and press Enter.

Nslookup returns one or more SRV records like:

Server:  jsi001.jsiinc.com                              Address:  192.168.0.1                              _ldap._tcp.dc._msdcs.jsiinc.com SRV service location:                                        priority       = 0                                        weight         = 100                                        port           = 389                                        svr hostname   = jsi001.jsiinc.com                              jsi001.jsiinc.com       internet address = 192.168.0.1
NOTE: If you have multiple network adapters, make sure that an internal adapter is first in the Binding Order.