You want to manually deregister a domain controller’s resource records.
With the following
<DomainControllerName> with the FQDN
of the domain controller you want to deregister and
<DomainDNSName> with the FQDN of the
domain of which the domain controller is a member:
> nltest /dsderegdns:<
When a domain controller is demoted from a domain, it dynamically deregisters its resource records. This is a nice feature of the demotion process because it means you do not have to manually remove all of the resource records or wait for scavenging to remove them. If, however, you have a domain controller that crashes and you do not plan on bringing it back online, you’ll need to remove the records manually or wait for scavenging.
You can use the DNS Mgmt MMC snap-in and even the
dnscmd.exe utility to remove them one by one, or
you can use the
nltest command, as shown in the
switch also has
options if you want to delete the records that are based on the
domain GUID and DSA GUID,
respectively. You need to know the actual GUIDs of the
domain and domain controller to use those switches, so if you
don’t have them handy,
it would be easier to delete them
using the DNS Mgmt MMC snap-in.