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The Windows netlogon service is responsible to register the following SRV records with DNS:

1. _udp.DNSDomainName
2. _tcp.DNSDomainName
3. _sites.DNSDomainName
4. _mcdcs.DNSDomainName

If it so happens that these records are non-existent then we can manually repair the DNS entries:

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1. Restart the Netlogon service on a Domain controller or
2. Run Netdiag/Fix command on a Domain controller

If the above steps do not work then proceed with the following:

1. Open DNS management console
2. Right click the relevant zone and Delete
3. Right click Forward Lookup Zones and select New Zone
4. Select the Zone type and type the name of the zone to match AD name.
5. Select or create new zone file
6. Right click new zone and “Allow Dynamic updates
7. Restart the netlogon service
8. Check for SRV records mentioned above.

Active Directory DNS netdiag netlogon service srv recordsActive Directory DNS netdiag netlogon service srv records