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It might be easier to drop your scope lease time really low, then delete all the dynamic DNS records and let them get re-created.
If you're waiting on DNS scavenging, there's no fast way to do it.
By default, the ACL gives Create permission to all members of the Authenticated User group, the group of all authenticated computers and users in an Active Directory forest.
This means that any authenticated user or computer can create a new object in the zone.
Just let it ride until you're seeing id 2501 events in the DNS Server event logs.
I'm afraid that you're going to have to approach this from the client end.
Secure Dynamic Update Updating DNS Resource Recordshttps://technet.microsoft.com/en-us/library/ff631099(v=ws.10)How to configure DNS dynamic updates in Windows Server 2003. Using DNS servers with DHCP (Contains information on the Dns Update Proxy group and its usage) (WS.10)=============================================================== The credentials only need to be a plain-Jane, non-administrator, user account. Make sure ALL other non-DHCP servers are NOT in the Dns Update Proxy group.You, as a DHCP administrator, might want to enable DNS integration in order to automatically update the DNS records dynamically with the DHCP client computers’ information whenever the DHCP server assigns the IP address and other settings to them.Since the DHCP server always assigns the dynamic IP addresses to the client computers which may change from time to time, and the DNS maintains the records of the information about the host names and their corresponding IP addresses, there must be some technology with the help of which the DNS server records can automatically get updated with the latest IP addresses that the DHCP server has assigned to the DHCP clients.Those records have an ACL on them to stop registered records from being hijacked by other hosts.When DHCP is used to allocate IP addresses, the default configuration is shown below—which tells the DHCP server to register records in DNS on behalf of clients only if requested to do so by the client or if the client is unable to dynamically register (e.g., Windows NT 4.0).I tried restarting the DHCP server the Full server sevral times but no success.The settings hasn't been changed, but I checked and it has a lot's of free IP -s and the scope is activated and the server is Authorized to serve DHCP.riginally posted this in 4/2006, and updated throughout the years, but I still get questions from time to time asking why updates are not working, especially PTR.Well, I thought it’s time for an update and to just offer a summary in the beginning, because in this day and age, no one wants to read!Have you tried stopping and restarting the DHCP service on the server?Open the DHCP mmc and right click the server, and select Reconcile all scopes.