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ksetup removerealm

Deletes all information for the specified realm from the registry. Windows commands reference

On Windows

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Windows

from the Windows commands reference, CC BY 4.0

Deletes all information for the specified realm from the registry. The realm name is stored in the registry under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\Kerberos and HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Lsa\Kerberos. This entry doesn't exist in the registry by default. You can use the ksetup addrealmflags command to populate the registry. IMPORTANT: You can't remove the default realm name from the domain controller because this resets its DNS information, and removing it might make the domain controller unusable.

ksetup /removerealm <realmname>
ksetup /removerealm CORP.CONTOSO.CON
<realmname>Specifies the uppercase DNS name, such as CORP.CONTOSO.COM, and is listed as the default realm or Realm= when ksetup is run.