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DNS_ERROR_INVALID_POLICY_TABLE
Failure can occur before the DNS query
DNS_ERROR_INVALID_POLICY_TABLE identifies corruption in the Windows Name Resolution Policy Table (NRPT). The DNS Client service checks NRPT before sending a query and applies matching namespace rules for DNS servers, DNSSEC validation, and related policy. When the effective table cannot be processed, changing authoritative records or restarting a remote DNS server does not repair the local policy decision.
NRPT can be assembled from local and domain Group Policy, and rules from multiple policies can interact. Microsoft also documents that conflicting rules for the same namespace can prevent either rule from being applied. Diagnosis should preserve policy provenance instead of editing registry values blindly.
What to inspect
- Export the effective NRPT policy and the source Group Policy results before making changes.
- Look for malformed namespaces, conflicting rules, incomplete deployment, and stale local policy.
- Compare an affected machine with a healthy machine in the same OU and security-filtering scope.
- Repair or reapply the authoritative GPO/local rule set, then refresh policy and retest the exact FQDN.
Get-DnsClientNrptPolicy -EffectiveReferences
- Microsoft: Name Resolution Policy Table
- Microsoft: Get-DnsClientNrptPolicy
- Microsoft: DNS system error codes
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