Dhcp not updating reverse lookup zone

to protect against unsecured records or to permit members of the Dns Update Proxy group to register records in zones that allow only secured dynamic updates, you must create a dedicated user account and configure DHCP servers to perform DNS dynamic updates with the credentials of this account (user name, password, and domain).Multiple DHCP servers can use the credentials of one dedicated user account." Just to add: Why is the Dns Update Proxy group needed in conjunction with credentials?

If you check your servers event viewer you will see EVENT ID 1056: The DHCP service has detected that it is running on a DC and has no credentials configured for use with Dynamic DNS registrations initiated by the DHCP service. Credentials for Dynamic DNS registrations may be configured using the command line “netsh dhcp server set dnscredentials” or via the DHCP Administrative tool.

Otherwise, the default process is outlined below, and this applies to non-Microsoft operating systems, too, but please note that non-Microsoft operating systems can't use Kerberos to authenticate to dynbamically update into a Secure Only zone, however you can configure Windows DHCP to do that for you. By default, Windows 2000 and newer statically configured machines will register their own A record (hostname) and PTR (reverse entry) into DNS. If set to DHCP, a Windows 2000, 2003 or XP machine, will request DHCP to allow the machine itself to register its own A (forward entry) record, but DHCP will register its PTR (reverse entry) record. If Windows 2008/Vista, or newer, the DHCP server always registers and updates client information in DNS.

Note: "This is a modified configuration supported for DHCP servers running Windows Server 2008 and DHCP clients.

If you want more information you may find the following useful:

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