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Windows Server Remote Desktop Services disruption after September 2026 cumulative updates

Service Disruption
First reported
Last updated
Happening score
H score 0
2 unique sources, 3 articles

Summary

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Windows Server Remote Desktop Services is experiencing a service disruption after the September 2026 cumulative updates, leaving some systems unable to accept new connections and causing sessions to hang. The affected scope includes Windows Server 2019, 2022, and 2025 installations, and some administrators report that only a hard reset restores functionality. Rolling back the update has restored service for some environments, but that also removes the month's security fixes.

Related Happenings

Windows 11 KB5124008 Active Directory domain trust breakage

Service Disruption
H score0 First: 16.09.2026 23:39 Last: 16.09.2026 23:39 Sources 1

About this happening: The Windows 11 KB5124008 security update is breaking Active Directory domain trust on some enterprise systems, preventing valid users from signing in after reboot. Microso...

Latest development: 17.09.2026 11:24

Microsoft shared a temporary workaround for Windows 11 systems where the September 2026 security updates trigger Machine Identity Isolation enforcement and break domain trust and valid credential sign-ins on enterprise devices. Admins should disable Machine Identity Isolation using the same method used to enable it, restart the device, and reset the secure channel; Microsoft also says the feature is only supported in environments connected to Windows Server 2025 Domain Functional Level (DFL) and above.

Open Happening

Windows 11 24H2 Home and Pro end-of-updates upgrade advisory

Advisory/Mitigation
H score25 First: 19.08.2026 12:10 Last: 19.08.2026 12:10 Sources 1

About this happening: Microsoft told customers that Windows 11 24H2 Home and Pro will reach end of updates on October 13, 2026, leaving affected devices without monthly security and non-s...

Open Happening

Windows 10 KB5120249 cumulative update (August 2026 Patch Tuesday)

Security Patch Release
H score26 First: 11.08.2026 21:26 Last: 11.08.2026 21:26 Sources 1

About this happening: Microsoft released Windows 10 KB5120249 for versions 22H2 and 21H2, making it a mandatory Patch Tuesday update for supported systems. The release fixes security...

Open Happening

Microsoft Windows 10 KB5099539 extended security update

Security Patch Release
H score16 First: 14.07.2026 21:49 Last: 14.07.2026 21:49 Sources 1

About this happening: Microsoft released Windows 10 KB5099539, a security update bundle for Windows 10 ESU that rolls in July 2026 Patch Tuesday fixes for 570 vulnerabilities. The p...

Open Happening

Windows 11 KB5101650 and KB5099414 cumulative updates

Security Patch Release
H score27 First: 14.07.2026 20:41 Last: 14.07.2026 20:41 Sources 1

About this happening: Microsoft released Windows 11 KB5101650 and KB5099414 cumulative updates for 25H2/24H2 and 23H2, delivering the July 2026 Patch Tuesday fixes for 571 vul...

Open Happening

Timeline

  1. 14.09.2026 23:52 2 articles · 9d ago

    Microsoft releases out-of-band Windows updates to fix Remote Desktop Services failures

    Mitigation Patch Update

    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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  2. 10.09.2026 23:34 1 articles · 13d ago

    Windows Server Remote Desktop Services disruption after September 2026 cumulative updates

    Initial Disclosure

    September 2026 cumulative updates began triggering Remote Desktop Services failures on Windows Server systems. Early reports centered on connection failures, hung sessions, and environments where a hard reset was needed to recover.

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