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Event ID: 1056 Source: DhcpServer

The DHCP service has detected that it is running on a domain controller and has no credentials configured for use with Dynamic DNS registrations initiated by the DHCP service. This is not a recommended security configuration. Credentials for Dynamic DNS registrations may be configured using the command line "netsh dhcp server set dnscredentials" or via the DHCP Administrative tool.
T787034 provides information on how to configure a different account for Dynamic DNS updates. Typically, this could be just a regular user with no special permissions.
After you install the DHCP Server service on a Windows Server 2003 domain controller that is running the DNS Server service, the System event log may record this event. See WITP78665 to resolve this behavior.
As per ME282001: “This behavior occurs because you did not configure the DNSCredentials on the domain controller on which you installed the DHCP Server service, and DNS services. This is not a recommended configuration; see the "More Information" section in this article for more details.  To resolve this behavior, configure DNSCredentials". See ME282001 for information on how to do this.
The credentials can be set via command line as suggested, but that can be problematic sometimes. The changes can also be made via the DHCP MMC. Go into the properties of the DHCP server, not the scopes, and then select the "Advanced" tab and finally the "Credentials" button. Fill in the account information as requested. Also check the “Configure DNS dynamic update credentials” link for more details.

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