# Duplicate zone count should be retrievable

Duplicate or conflict DNS zones (indicated by CNF: or InProgress- prefixes) indicate:

Source: https://maester.dev/docs/tests/AD-DNS-15

<!-- This file is generated by website/scripts/generate-test-docs.mjs. Do not edit manually. -->

<div class="test-byline"><div class="test-byline-avatars"><a class="test-byline-avatar test-byline-avatar--author" href="/contributors/soulemike" title="Michael Soule · Original author"><img src="https://github.com/soulemike.png" alt="Michael Soule" width="28" height="28" loading="lazy" decoding="async" /></a></div><div class="test-byline-meta"><span class="test-byline-text">Contributed by <a href="/contributors/soulemike">Michael Soule</a></span><a class="test-byline-link" href="/contributors">All contributors →</a></div></div>

<p class="test-part">Part of <a href="/docs/tests/ad">Active Directory</a> · Active Directory · DNS · <a href="/docs/tests">All checks</a></p>

```powershell title="Run this check"
Invoke-Maester -TestId AD-DNS-15
```

## Overview

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

**Detective**

#### 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

This test identifies zones with names containing " CNF:" or "..InProgress-" prefixes, which indicate replication conflicts or incomplete operations.

#### Related Tests

- None currently

## Details

<details>
<summary>Every attribute of this check</summary>

| Field | Value |
| --- | --- |
| Test ID | AD-DNS-15 |
| Severity | Info |
| Suite | Active Directory |
| Product | Active Directory |
| Feature | DNS |
| Area | Infrastructure hardening |
| Resource type | DnsZone |
| MITRE ATT&CK | None |
| PowerShell test | [Test-MtAdDnsDuplicateZoneCount](https://github.com/maester365/maester/blob/main/tests/ad/dns/Test.AD-DNS-15.ps1) |
| Services | ActiveDirectory |
| Permissions | ActiveDirectory:Remoting:Microsoft.PowerShell, ActiveDirectory:Cim:root\MicrosoftDNS:MicrosoftDNS_Zone:Read, ActiveDirectory:Cim:root\MicrosoftDNS:MicrosoftDNS_ResourceRecord:Read, ActiveDirectory:Cim:root\MicrosoftDNS:MicrosoftDNS_RootHints:Read |

</details>

## Source

- Test: [`tests/ad/dns/Test.AD-DNS-15.ps1`](https://github.com/maester365/maester/blob/main/tests/ad/dns/Test.AD-DNS-15.ps1)
- Documentation: [`tests/ad/dns/Test.AD-DNS-15.md`](https://github.com/maester365/maester/blob/main/tests/ad/dns/Test.AD-DNS-15.md)