What does Windows error code 9951 (DNS_ERROR_ZONESCOPE_ALREADY_EXISTS) mean?

 
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DNS_ERROR_DEFAULT_VIRTUALIZATION_INSTANCE DNS_ERROR_ZONESCOPE_DOES_NOT_EXIST

DNS_ERROR_ZONESCOPE_ALREADY_EXISTS

DNS_ERROR_ZONESCOPE_ALREADY_EXISTS means that a zone scope with the requested name already exists in the target DNS zone. A zone scope is an alternate record set inside one zone, commonly used by DNS Policies for split-brain DNS or location-aware answers.

What to verify

  • List the existing scopes before creating another one; scope names are unique within a zone.
  • Confirm that the command targets the intended DNS server and zone. Policy configuration can differ between servers.
  • Reuse the existing scope only after checking that its records and policy references match the intended design.
Get-DnsServerZoneScope -ZoneName "example.com"
Get-DnsServerQueryResolutionPolicy -ZoneName "example.com"

Microsoft: Get-DnsServerZoneScope

Microsoft: Add-DnsServerZoneScope

Microsoft: DNS Policies overview


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