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| DNS_ERROR_CLIENT_SUBNET_DOES_NOT_EXIST | DNS_ERROR_SUBNET_DOES_NOT_EXIST |
DNS_ERROR_CLIENT_SUBNET_ALREADY_EXISTS
DNS_ERROR_CLIENT_SUBNET_ALREADY_EXISTS means the requested client-subnet name is already defined on the DNS server. A client subnet is a named group of IPv4 and IPv6 prefixes used by policies.
What to verify
- Inspect the existing definition before changing it; it may be referenced by one or more policies.
- Confirm whether the required prefix should be added to the existing logical subnet rather than creating another name.
- Keep names semantically stable, such as by region, site, resolver tier, or other policy purpose.
Get-DnsServerClientSubnetMicrosoft: Get-DnsServerClientSubnet
Microsoft: Set-DnsServerClientSubnet
Microsoft: Add-DnsServerQueryResolutionPolicy
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