Administrators say Microsoft’s September 2026 security updates are causing Remote Desktop Services to fail on some Windows Server systems, blocking new remote logins and in some cases forcing hard reboots. Reports affect Windows Server 2019 KB5122876, Server 2022 KB5122882, and Server 2025 KB5122871 after Patch Tuesday installation. Affected servers may work for hours before RDS hangs, especially around user logoff; uninstalling the updates reportedly restores service.
Why it matters: This is urgent for organizations that rely on Windows Remote Desktop to run or administer servers, because a required security update may also knock out remote access. Defenders should test September Server updates carefully, monitor RDS hosts for hangs or failed logoffs, and weigh rollback against losing this month’s security fixes until Microsoft issues guidance.
Lawrence Abrams
2026.09.14
98% relevant
This article advances the same event by reporting that Microsoft has now issued out-of-band updates to fix the RDS failures, naming the KB packages for affected Windows and Windows Server versions and noting additional fixes for Hyper-V and some USB audio issues.
Sergiu Gatlan
2026.09.14
98% relevant
This article directly updates the same event by adding Microsoft's confirmation, broader affected scope including Windows Server 2012 and later plus Windows 10 and 11, specific symptoms, and Microsoft-provided Group Policy mitigations while a permanent fix is pending.
Lawrence Abrams
2026.09.10
100% relevant
This article establishes a distinct new operational security story: the September 2026 Windows Server Patch Tuesday updates themselves are causing widespread Remote Desktop Services failures across supported server versions.
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