AD-DNS-15: Duplicate zone count should be retrievable
| ID | AD-DNS-15 |
| Severity | Info |
| Suite | Active Directory (on-premises) |
| Product | Active Directory |
| Feature | DNS |
| Security area | Infrastructure hardening |
| Resource type | DnsZone |
| Reads from | On-premises Active Directory |
What this checks and how to fix it
Section titled “What this checks and how to fix it”Duplicate or conflict DNS zones (indicated by CNF: or InProgress- prefixes) indicate:
- Replication conflicts: The same zone was created on multiple DCs simultaneously
- Incomplete operations: Zone creation started but did not complete
- Directory issues: Potential problems with Active Directory replication
- Configuration drift: Inconsistent state across domain controllers
These zones should be investigated and resolved to ensure consistent DNS behavior.
Control Type
Section titled “Control Type”Detective
Security Recommendation
Section titled “Security Recommendation”- Investigate all duplicate/conflict zones immediately
- Resolve replication conflicts following Microsoft guidance
- Verify zone consistency across all DNS servers
- Monitor for future conflict creation
How the Test Works
Section titled “How the Test Works”This test identifies zones with names containing “ CNF:” or “..InProgress-” prefixes, which indicate replication conflicts or incomplete operations.
Related Tests
Section titled “Related Tests”- None currently
Mito check. Author: soulemike. Open-source licences.
Open-source licences. CIS Benchmark material © Center for Internet Security, Inc.; CISA SCuBA baselines are public domain (CC0).
© 2026 Virtual Petals. Mito is a Virtual Petals service, hosted in Microsoft Azure UAE North.