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Windows 11 KB5124008 Active Directory domain trust breakage

Service Disruption
First reported
Last updated
Happening score
H score 0
1 unique sources, 1 articles

Summary

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The Windows 11 KB5124008 security update is breaking Active Directory domain trust on some enterprise systems, preventing valid users from signing in after reboot. Microsoft is investigating the disruption, and affected machines may lose their secure channel with domain controllers. Some administrators have temporarily restored access by changing Machine Identity Isolation settings and repairing the secure channel.

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H score0 First: 10.09.2026 23:34 Last: 10.09.2026 23:34 Sources 1

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Latest development: 14.09.2026 23:52

Microsoft released out-of-band Windows updates on September 14, 2026, to fix Remote Desktop Services failures on affected Windows Server and Windows client systems after September 2026 security updates caused RDP connection and sign-in failures and, in some cases, unresponsive servers. The company also said it had previously provided Group Policy mitigations while it worked on a permanent fix.

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Service Disruption
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Open Happening

Timeline

  1. 16.09.2026 23:39 2 articles · 1h ago

    Microsoft investigates Windows 11 KB5124008 domain trust failures

    Initial Disclosure

    Microsoft is investigating reports that the Windows 11 KB5124008 security update is breaking domain trust relationships on some enterprise systems, preventing users with valid Active Directory credentials from logging in after reboot. Administrators say affected computers lose their secure channel with Active Directory after the update is installed and devices restart, and some reports link the failures to Windows Machine Identity Isolation in audit or enforcement mode.

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