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DNS_ERROR_NODE_IS_CNAME
DNS_ERROR_NODE_IS_CNAME means the owner name already has a CNAME record. A CNAME alias is intended to identify an alias to a canonical name, so it cannot coexist with ordinary data records at the same owner name.
What to check
- Inspect every record at the owner name before adding another type.
- Choose either an alias design or direct records at that name, then migrate references deliberately.
- Check automated registration that may be trying to add A, AAAA, or service records to an alias name.
Get-DnsServerResourceRecord -ZoneName "contoso.com" -Name "alias"Microsoft: Get-DnsServerResourceRecord
Microsoft: DNS architecture, SOA, and authoritative zones
Microsoft: DNS logging and diagnostics
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