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Windows 11 Domain Trust Error After September 2026 Updates Windows 11 Domain Trust Error After September 2026 Updates Identify and fix it with Microsoft Intune After installing the September 2026 Windows 11 security updates, some domain-joined devices may lose their secure trust relationship with an on-premises Active Directory domain. Users may see: The trust relationship between this workstation and the primary domain failed. The user's credentials may be correct. The problem can instead be the computer's Secure Channel with Active Directory. Microsoft identified Machine Identity Isolation as the cause of this issue in affected environments. The September 8, 2026 security update causes Windows to begin honoring existing or policy-provisioned Machine Identity Isolation enforcement. Microsoft states that the feature is supported only when connected to domain controllers running at Windows Server 2025 Domain Functional Level (DFL) or later . ...

Microsoft Intune MAA Connectivity Validation Guide 🔐 Microsoft Intune MAA Connectivity Validation Guide This guide provides a practical method for validating network connectivity from a Windows 11 endpoint to the Microsoft Azure Attestation (MAA) endpoints used by Microsoft Intune. The objective is to determine whether DNS resolution, TCP 443 connectivity, HTTPS communication, proxy configuration and possible TLS inspection issues could prevent the endpoint from reaching the required MAA service. Executive Summary This guide validates the network path to the Microsoft Azure Attestation service. It is designed to help administrators distinguish a connectivity problem from a device health, Intune policy or compliance configuration problem. A successful test confirms that the tested endpoint can reach the MAA service over HTTPS. It does not by itself prove that a Windows Health Attestation session or Intune compliance evaluation has successfully comple...