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Microsoft Confirms September Updates Cause Remote Desktop Failures on Windows

· Original article ↗

Summary

Microsoft says September 2026 security updates can disrupt Remote Desktop Services on Windows Server, Windows 10, and Windows 11. Group Policy mitigations are available; restarting affected VMs or removing updates may temporarily restore access.

Key points

  • Microsoft confirmed the issue affects Windows Server 2012 and later, as well as Windows 10 and Windows 11.
  • RDP connections may fail after several minutes, hang during sign-in, or leave servers stuck at the Remote Desktop Configuration screen.
  • MMC, RDS Licensing Diagnoser, File Explorer, and the Windows Update page may also become unresponsive.
  • Microsoft provided Group Policy mitigations for enterprise-managed devices, with policies listed for affected Windows versions.
  • Restarting an affected virtual machine may temporarily restore RDS connectivity.
  • Rolling back the updates has also restored Remote Desktop functionality for some administrators, but removes the security fixes included in the updates.

Article Details

Event Type
Microsoft-confirmed service disruption caused by September 2026 security updates
Impact
The updates can destabilize Remote Desktop Services on Windows Server 2012 and later, Windows 10, and Windows 11. RDP connections may fail after several minutes or hang during sign-in; existing sessions may not disconnect or log off properly, and affected servers may hang. Microsoft also reported that MMC, RDS Licensing Diagnoser, File Explorer, and the Windows Update page may become unresponsive. Microsoft provided a Group Policy mitigation for enterprise-managed devices. Restarting affected virtual machines or rolling back the updates may temporarily restore connectivity; rolling back also removes the security fixes in those updates.

Vendors

MicrosoftMicrosoft confirmed that September 2026 security updates are causing Remote Desktop Services failures on Windows Server, Windows 10, and Windows 11 systems.

Products

Remote Desktop ServicesMicrosoft confirmed that September 2026 security updates are causing Remote Desktop Services failures on Windows Server, Windows 10, and Windows 11 systems.Windows 10Microsoft confirmed that September 2026 security updates are causing Remote Desktop Services failures on Windows Server, Windows 10, and Windows 11 systems.Windows 11Microsoft confirmed that September 2026 security updates are causing Remote Desktop Services failures on Windows Server, Windows 10, and Windows 11 systems.Windows ServerMicrosoft confirmed that September 2026 security updates are causing Remote Desktop Services failures on Windows Server, Windows 10, and Windows 11 systems.

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