Symptom
Delegated subdomain not resolving to DNS record on UltraDNS name servers.
Root Cause
- Delegation of subdomain to UltraDNS name servers from another DNS provider implemented using CNAME Record instead of NS Records
- Using a CNAME Record to alias a subdomain to UltraDNS name servers would only resolve queries as the name server itself (IP of name server)
- Only NS Records for the subdomain on authoritative name servers will delegate queries to UltraDNS name servers for resolution.
Steps to Resolution