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        A Quick Tip To Prevent NetLogon Service From Registering SRV and Domain Records

Section(s): Active Directory , DHCP and DNS, Active Directory , Miscellaneous, Active Directory, Miscellaneous, Active Directory
Published on Jan 05, 2011.
Last Modified on Oct 31, 2009.
Last Modified by Nirmal Sharma.
Rating: Not Rated

This article explains how you can use a registry hack to prevent NetLogon from registering SRV, CNAME and Domain DNS Records in the DNS Server.

By default, NetLogon service performs registration of SRV, CNAME and Domain DNS Records in the DNS Server every 24 hours or depending on the versions of Operating System in use. The DNS Server must support the Dynamic update so that registration is done dynamically. In some situations, you may require to disable this functionality. For example, you are using a DNS Server in your environment which does not support Dynamic Updates. NetLogon service may throw errors in Event Viewer if it is not able to register the missing SRV Records in DNS Server.

To disable this behaviour, use the below registry hack:

KEY Name: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NetLogon\Parameters
Entry Name: UseDynamicDns
Data: REG_DWORD
Value: 0 (disabled registration of SRV records dynamically) 1 (enabled registration of SRV records dynamically)

Note: The default value is 1. So NetLogon performs the registration of SRV and other records dynamically. If you disable this then you must register the SRV and other Records found in C:\Windows\System32\Config\NetLogon.DNS file.

About Nirmal Sharma

Nirmal is a Microsoft MVP in Directory Services and working as a Technical Architect/Consultant. He has been involved in Microsoft Technologies since 1994 and followed the progression of Microsoft Operating Systems and software. He is specialized in Directory Services, Microsoft Clustering, SQL, MOM, Exchange and Citrix. In his spare time, he likes to help others and write "internal" technical articles, white papers and tips on various Microsoft technologies. You can contact him at nirmal_sharma@mvps.org.