# Validate DNS Responses Based on Time of Day with an Azure Cloud App Server with AD/DNS evidence > Use DNS Responses Based on Time of Day with an Azure Cloud App Server to review this narrow operational decision without extending the source beyond its stated scope. - Canonical URL: https://update.dsesecurity.com/updates/validate-dns-responses-based-on-time-of-day-with-an-azure-cloud-app-server-with-ad-dns-evidence/ - Publisher: Detection Systems & Engineering (DSE Security) - Author: DSE Security Editorial Team - Published: 2026-08-27T17:05:44+00:00 - Modified: 2026-08-27T17:14:53+00:00 - Last reviewed by DSE: 2026-08-27 - Resource type: Checklist - DSE priority: Advisory - Topics: Cybersecurity, Microsoft 365 & Identity, Networks & Infrastructure - Reading time: 3 minutes ## What you need to know Use DNS Responses Based on Time of Day with an Azure Cloud App Server 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 DNS Responses Based on Time of Day with an Azure Cloud App Server ## DSE recommendation Compare the observed state with the cited official source, document applicability and exceptions, and test any approved change with rollback safeguards. ## Article Treat this document as a focused evidence review: Validate DNS Responses Based on Time of Day with an Azure Cloud App Server with AD/DNS evidence. Only the official source and traced locations below supply facts. Confirm applicability before acting. ## Source fact: The official [DNS Responses Based on Time of Day with an Azure Cloud App Server](https://learn.microsoft.com/en-us/windows-server/networking/dns/deploy/dns-tod-azure-cloud-app-server) from Microsoft supports the following bounded statements: - At Introduction below H1, Microsoft states: “You can use this topic to learn how to distribute application traffic across different geographically distributed instances of an application by using DNS policies that are based on the time of day.” The research record locates this support at Introduction below H1. - At Introduction below H1, Microsoft states: “This allows you to load balance traffic across application instances during peak time periods when your primary servers are overloaded with traffic.” 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 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. A correct source interpretation can still be inapplicable to a particular design. Confirm Active Directory replication, domain-controller health, service accounts, routing, time, certificates, and upstream resolution, ownership, and change authority instead of treating documented behavior as a deployment guarantee. ## 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 Windows DNS servers, AD-integrated zones, policies, forwarders, logging channels, clients, and administrative roles, which versions, roles, and configuration states define the review population? - Could Active Directory replication, domain-controller health, service accounts, routing, time, certificates, and upstream resolution 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 Windows DNS servers, AD-integrated zones, policies, forwarders, logging channels, clients, and administrative roles, observed and expected states, owner, and reason for deviation. If the review warrants change, use a bounded implementation with prerequisites, test population, monitoring, abort criteria, and a rehearsed reversal. Sequence checks for Active Directory replication, domain-controller health, service accounts, routing, time, certificates, and upstream resolution and sanitize protected material before retention. ## Verification and evidence Evidence should let another reviewer reproduce this decision. Retain observations beside the traced locations Introduction below H1; Introduction below H1. Favor PowerShell exports, zone and policy inventories, sanitized query tests, event-channel data, replication state, and rollback commands, linked to stable identifiers, time, and operator. Label this evidence set DSE-20260827-102 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 - [DNS Responses Based on Time of Day with an Azure Cloud App Server](https://learn.microsoft.com/en-us/windows-server/networking/dns/deploy/dns-tod-azure-cloud-app-server) — Microsoft ## Primary reference - Name: DNS Responses Based on Time of Day with an Azure Cloud App Server - Authority: Microsoft Learn - URL: https://learn.microsoft.com/en-us/windows-server/networking/dns/deploy/dns-tod-azure-cloud-app-server - Source publication date: Not stated by the source ## Citation and use Preferred citation: “Validate DNS Responses Based on Time of Day with an Azure Cloud App Server with AD/DNS evidence,” DSE Security, https://update.dsesecurity.com/updates/validate-dns-responses-based-on-time-of-day-with-an-azure-cloud-app-server-with-ad-dns-evidence/ 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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