# Trace Use Event1644Reader.ps1 to analyze LDAP query performance across Active Directory and Windows DNS > Use Use Event1644Reader.ps1 to analyze LDAP query performance to review this narrow operational decision without extending the source beyond its stated scope. - Canonical URL: https://update.dsesecurity.com/updates/trace-use-event1644reader-ps1-to-analyze-ldap-query-performance-across-active-directory-and-windows/ - Publisher: Detection Systems & Engineering (DSE Security) - Author: DSE Security Editorial Team - Published: 2026-08-27T17:02:22+00:00 - Modified: 2026-08-27T17:29:40+00:00 - Last reviewed by DSE: 2026-08-27 - Resource type: Guide - DSE priority: Advisory - Topics: Cybersecurity, Microsoft 365 & Identity, Networks & Infrastructure - Reading time: 3 minutes ## What you need to know Use Use Event1644Reader.ps1 to analyze LDAP query performance 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 Use Event1644Reader.ps1 to analyze LDAP query performance ## DSE recommendation Compare the observed state with the cited official source, document applicability and exceptions, and test any approved change with rollback safeguards. ## Article Use this document to connect an official requirement or behavior to observable evidence: Trace Use Event1644Reader.ps1 to analyze LDAP query performance across Active Directory and Windows DNS. Only the official source and traced locations below supply facts. Confirm applicability before acting. ## Source fact: The official [Use Event1644Reader.ps1 to analyze LDAP query performance](https://learn.microsoft.com/en-us/troubleshoot/windows-server/active-directory/event1644reader-analyze-ldap-query-performance) from Microsoft supports the following bounded statements: - At Introduction below H1, Microsoft states: “This article describes a script that helps analyze Active Directory event ID 1644 in Windows Server.” The research record locates this support at Introduction below H1. - At Introduction below H1, Microsoft states: “Review the steps to use the script and then analyze your problems.” The research record locates this support at Introduction below H1. These statements are the factual basis for this document. Do not extend them into a broader assurance. Review Active Directory objects, search bases, domain controllers, delegated roles, cmdlet parameters, and the DNS paths used to locate directory services 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. The citation is not a substitute for observed state, authorization, compliance evidence, or dependency health. Examine Active Directory replication, Windows DNS, domain-controller location, time, network reachability, privileges, and protected credentials before translating the source into an operational decision. ## Applicability questions - For source statement 1 at Introduction below H1, which observable configuration, record, or test can confirm applicability here? - For source statement 2 at Introduction below H1, which observable configuration, record, or test can confirm applicability here? - Which deployed instance of Active Directory objects, search bases, domain controllers, delegated roles, cmdlet parameters, and the DNS paths used to locate directory services 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, Windows DNS, domain-controller location, time, network reachability, privileges, and protected credentials? - 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 Active Directory objects, search bases, domain controllers, delegated roles, cmdlet parameters, and the DNS paths used to locate directory services, observed and expected states, owner, and reason for deviation. An implementation decision needs an owner, approved window, prechecks, observable outcome, stop authority, and rollback path. Validate Active Directory replication, Windows DNS, domain-controller location, time, network reachability, privileges, and protected credentials before and after the test, and store only sanitized operational evidence. ## Verification and evidence Keep the source locations Introduction below H1; Introduction below H1 adjacent to the sanitized artifacts used for comparison. Prefer sanitized command transcripts, parameter records, directory exports, authorization records, DNS locator tests, and before-and-after state, with enough identity and timing data for an independent recheck. Label this evidence set DSE-20260827-304 so observations, approvals, exceptions, and later rechecks cannot be substituted from another source review. Preserve both successful and failed observations, along with approval and rollback evidence. Avoid uncontrolled production experiments. Assign an expiry or event-driven recheck so the conclusion is not treated as permanent. ## Official references - [Use Event1644Reader.ps1 to analyze LDAP query performance](https://learn.microsoft.com/en-us/troubleshoot/windows-server/active-directory/event1644reader-analyze-ldap-query-performance) — Microsoft ## Primary reference - Name: Use Event1644Reader.ps1 to analyze LDAP query performance - Authority: Microsoft Learn - URL: https://learn.microsoft.com/en-us/troubleshoot/windows-server/active-directory/event1644reader-analyze-ldap-query-performance - Source publication date: Not stated by the source ## Citation and use Preferred citation: “Trace Use Event1644Reader.ps1 to analyze LDAP query performance across Active Directory and Windows DNS,” DSE Security, https://update.dsesecurity.com/updates/trace-use-event1644reader-ps1-to-analyze-ldap-query-performance-across-active-directory-and-windows/ 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. 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