NewsPublished 10 Sep 2026

September Windows Server updates break Remote Desktop Services

Source Bleeping Computer

windows

Description

The September 2026 cumulative updates for Windows Server 2019, 2022, and 2025 are causing Remote Desktop Services (RDS) failures. After installing these updates, RDS initially works but then starts failing after a few hours or after users log out, preventing new connections and causing existing sessions to hang. Some administrators report that the only way to restore functionality is a hard reset. Rolling back the updates restores RDS functionality but removes the security fixes. Microsoft has not yet confirmed the cause or provided a fix.

Impact

The issue disrupts Remote Desktop Services on affected Windows Server versions, preventing users from connecting remotely and causing existing sessions to hang. This can lead to operational downtime and may require hard resets to restore service. Rolling back the updates removes the security fixes, potentially exposing systems to vulnerabilities addressed by the September 2026 patches.

Defensive guidance

Administrators experiencing these issues have found that rolling back the September 2026 cumulative updates restores Remote Desktop Services functionality. However, this also removes the security patches included in these updates. Monitor official Microsoft communications for updates and patches addressing this issue before reapplying the updates.

References

bleepingcomputer.com/news/microsoft/september-windows-server-updates-break-remote-desktop-services/ (opens in a new tab)

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Description

AI analysisMachine-generated, updated 10 Sep 2026, 20:47 UTC

References

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