# Clear-DnsServerCache: clear dns server cache against recorded identity and DNS state > Use Clear-DnsServerCache to review this narrow operational decision without extending the source beyond its stated scope. - Canonical URL: https://update.dsesecurity.com/updates/clear-dnsservercache-clear-dns-server-cache-against-recorded-identity-and-dns-state/ - Publisher: Detection Systems & Engineering (DSE Security) - Author: DSE Security Editorial Team - Published: 2026-08-27T17:02:48+00:00 - Modified: 2026-08-27T17:26:01+00:00 - Last reviewed by DSE: 2026-08-27 - Resource type: Explainer - DSE priority: Advisory - Topics: Cybersecurity, Microsoft 365 & Identity, Networks & Infrastructure - Reading time: 3 minutes ## What you need to know Use Clear-DnsServerCache to review this narrow operational decision without extending the source beyond its stated scope. ## Potentially affected Teams, systems, services, or facilities within the stated scope of Clear-DnsServerCache ## DSE recommendation Compare the observed state with the cited official source, document applicability and exceptions, and test any approved change with rollback safeguards. ## Article Frame this document as a source-led configuration and assurance check: Clear-DnsServerCache: clear dns server cache against recorded identity and DNS state. Only the official source and traced locations below supply facts. Confirm applicability before acting. ## Source fact: The official [Clear-DnsServerCache](https://learn.microsoft.com/en-us/powershell/module/dnsserver/clear-dnsservercache?view=windowsserver2025-ps) from Microsoft supports the following bounded statements: - At SYNOPSIS, Microsoft states: “Clears resource records from a cache on the DNS server.” The research record locates this support at SYNOPSIS. - At DESCRIPTION, Microsoft states: “The Clear-DnsServerCache cmdlet clears resource records from a Domain Name System (DNS) server cache.” The research record locates this support at DESCRIPTION. These statements are the factual basis for this document. Do not extend them into a broader assurance. Review Windows DNS servers, AD-integrated zones, policies, forwarders, logging channels, clients, and administrative roles only where the source and recorded environment align. ## What the source does not establish The cited page and retained statements do not establish the current state of any DSE or customer environment, prove that the documented configuration is applicable, or authorize a production change. Confirm supported versions, dependencies, and the current live source before use. No current deployment state or change approval follows from the source alone. Validate Active Directory replication, domain-controller health, service accounts, routing, time, certificates, and upstream resolution, and treat examples or options as conditional inputs rather than defaults. ## Applicability questions - For source statement 1 at SYNOPSIS, which observable configuration, record, or test can confirm applicability here? - For source statement 2 at DESCRIPTION, which observable configuration, record, or test can confirm applicability here? - Which deployed instance of Windows DNS servers, AD-integrated zones, policies, forwarders, logging channels, clients, and administrative roles will be compared with the source, and why that instance? - How will the review distinguish a source mismatch from a failure in Active Directory replication, domain-controller health, service accounts, routing, time, certificates, and upstream resolution? - Who approves the conclusion, exception, test window, and rollback threshold? ## DSE recommendation: DSE recommends using the cited source as the evidence anchor for this decision. Start with applicability, then compare the observed state with the cited source. Record the source location, examined part of Windows DNS servers, AD-integrated zones, policies, forwarders, logging channels, clients, and administrative roles, observed and expected states, owner, and reason for deviation. For an approved change, define prerequisites, a limited test path, success and stop conditions, monitoring, and rollback. Check Active Directory replication, domain-controller health, service accounts, routing, time, certificates, and upstream resolution in design order. Protect credentials, keys, recovery material, personal data, and sensitive topology in evidence. ## Verification and evidence Keep the source locations SYNOPSIS; DESCRIPTION adjacent to the sanitized artifacts used for comparison. Prefer PowerShell exports, zone and policy inventories, sanitized query tests, event-channel data, replication state, and rollback commands, with enough identity and timing data for an independent recheck. Label this evidence set DSE-20260827-278 so observations, approvals, exceptions, and later rechecks cannot be substituted from another source review. Keep before-state evidence, approval, test or change result, exceptions, and after-state evidence together. Use an approved lab, window, or nonproduction path for risky tests. Set a recheck trigger for version, architecture, dependency, vendor, incident, or ownership change. A check proves only what was observed. ## Official references - [Clear-DnsServerCache](https://learn.microsoft.com/en-us/powershell/module/dnsserver/clear-dnsservercache?view=windowsserver2025-ps) — Microsoft ## Primary reference - Name: Clear-DnsServerCache - Authority: Microsoft Learn - URL: https://learn.microsoft.com/en-us/powershell/module/dnsserver/clear-dnsservercache?view=windowsserver2025-ps - Source publication date: Not stated by the source ## Citation and use Preferred citation: “Clear-DnsServerCache: clear dns server cache against recorded identity and DNS state,” DSE Security, https://update.dsesecurity.com/updates/clear-dnsservercache-clear-dns-server-cache-against-recorded-identity-and-dns-state/ Publishing principles: https://update.dsesecurity.com/updates/dse-updates-editorial-methodology/ Usage and citation policy: https://update.dsesecurity.com/usage/ Copyright © 2026 Detection Systems & Engineering. All rights reserved.