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DNS_ERROR_CANNOT_FIND_ROOT_HINTS
Recursive resolution has no root-server bootstrap data
Root hints are names and addresses of DNS root servers used to begin iterative resolution when a server cannot answer from authoritative zones or cache and no applicable forwarder handles the query. MS-DNSP describes loading root hints during initialization from directory or file-backed persistent storage and Windows DNS documentation treats root hints as an alternative path to forwarding.
Check whether the server is intended to recurse directly or to use forwarders. On a server that should perform iterative Internet resolution, an empty or failed root-hint load is actionable. On a deliberately forward-only design, investigate the configured forwarding path instead of inventing root records inside a normal zone. Root hints must remain bootstrap data, not application DNS records.
What to inspect
- Inspect the server root-hint set and confirm that it contains both root-server names and usable addresses.
- Review DNS Server startup events for failures loading persistent or directory-backed hint data.
- Confirm whether forwarding policy is expected to handle external names before rebuilding root hints.
References
- MS-DNSP: DNS Server initialization and zone loading
- MS-DNSP glossary: root hints, RODC, and DNS server terms
- Microsoft: DNS forwarding, conditional forwarding, and root hints
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