# Trace Appendix L - Events to Monitor across Active Directory and Windows DNS > Use Appendix L - Events to Monitor to review this narrow operational decision without extending the source beyond its stated scope. - Canonical URL: https://update.dsesecurity.com/updates/trace-appendix-l-events-to-monitor-across-active-directory-and-windows-dns/ - Publisher: Detection Systems & Engineering (DSE Security) - Author: DSE Security Editorial Team - Published: 2026-08-27T17:06:07+00:00 - Modified: 2026-08-27T17:11:10+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 Appendix L - Events to Monitor 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 Appendix L - Events to Monitor ## 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 Appendix L – Events to Monitor across Active Directory and Windows DNS. Only the official source and traced locations below supply facts. Confirm applicability before acting. ## Source fact: The official [Appendix L – Events to Monitor](https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/plan/Appendix-L--Events-to-Monitor) from Microsoft supports the following bounded statements: - At Introduction below H1, Microsoft states: “The following table lists events that you should monitor in your environment, according to the recommendations provided in Monitoring Active Directory for Signs of Compromise.” The research record locates this support at Introduction below H1. - At Introduction below H1, Microsoft states: “All organizations should test these recommendations in their environments before creating alerts that require mandatory investigative responses.” 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 forests, domains, controllers, directory partitions, trusts, sites, replication links, service accounts, and delegated 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. Do not read the source as proof of implementation or permission to change production. Its guidance remains conditional on Windows DNS, time synchronization, network reachability, PKI, backups, virtualization safeguards, and privileged identity and the environment’s recorded constraints. ## 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? - Within forests, domains, controllers, directory partitions, trusts, sites, replication links, service accounts, and delegated roles, which versions, roles, and configuration states define the review population? - Could Windows DNS, time synchronization, network reachability, PKI, backups, virtualization safeguards, and privileged identity invalidate the test, hide a failure, or change applicability? - Who owns the decision, and which observation requires stopping, escalation, or rollback? ## 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 forests, domains, controllers, directory partitions, trusts, sites, replication links, service accounts, and delegated roles, observed and expected states, owner, and reason for deviation. Do not move from citation to production in one step. Pilot the decision where practical, observe agreed signals, retain a reversal point, and verify Windows DNS, time synchronization, network reachability, PKI, backups, virtualization safeguards, and privileged identity. Handle credentials, keys, recovery data, and personal information through approved secure channels. ## Verification and evidence Evidence should let another reviewer reproduce this decision. Retain observations beside the traced locations Introduction below H1; Introduction below H1. Favor directory and policy exports, replication and locator tests, event logs, trust state, role ownership, and controlled authentication tests, linked to stable identifiers, time, and operator. Label this evidence set DSE-20260827-079 so observations, approvals, exceptions, and later rechecks cannot be substituted from another source review. Retain the starting state, authorization, execution record, outcome, deviation, and final state as one review package. Move disruptive checks to an approved test path. Reopen the decision when versions, design, dependencies, ownership, or official guidance changes. ## Official references - [Appendix L – Events to Monitor](https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/plan/Appendix-L--Events-to-Monitor) — Microsoft ## Primary reference - Name: Appendix L - Events to Monitor - Authority: Microsoft Learn - URL: https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/plan/Appendix-L--Events-to-Monitor - Source publication date: Not stated by the source ## Citation and use Preferred citation: “Trace Appendix L - Events to Monitor across Active Directory and Windows DNS,” DSE Security, https://update.dsesecurity.com/updates/trace-appendix-l-events-to-monitor-across-active-directory-and-windows-dns/ 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.