Data type


Default value


0 | 1



Determines whether the Net Logon service on this domain controller uses Domain Name System (DNS) dynamic updates. Net Logon can use DNS dynamic updates to register DNS names identifying the domain controller.

DNS dynamic updates provide automatic updates of zone data, such as DNS names, on the zone's primary server whenever an authorized zone server requests an update. It supplements the static, manual method of adding and changing zone records. The DNS dynamic update protocol is defined in RFC 2136, Dynamic Updates in the Domain Name System (DNS UPDATE).




Net Logon does not use DNS dynamic updates to register the names identifying this domain controller. Records specified in the Netlogon.dns file ( Systemroot \System32\config\netlogon.dns) must be registered manually in DNS.


Net Logon uses DNS dynamic updates to register the names identifying this domain controller.

You might consider disabling Net Logon's use of DNS dynamic updates if your DNS servers do not support DNS dynamic updates or if you want to eliminate the network traffic associated with periodic registration of Net Logon's DNS records.

Note Image Note

This entry is supported on domain controllers only.

Windows 2000 does not add this entry to the registry. You can add it by editing the registry or by using a program that edits the registry.

Tip Image Tip

This entry does not enable or disable support for DNS dynamic updates on this server. It only affects use of DNS dynamic updates by the Net Logon service. To enable DNS dynamic updates on a server, use the DNS snap-in. Right-click the name of a zone, click Properties, click the General tab, and in the Dynamic update box, select Allow Updates.