September Windows Server updates break Remote Desktop Services
September 2026 Windows Server cumulative updates cause Remote Desktop Services failures on Server 2019, 2022 and 2025, forcing some admins to roll back.
Admins report Remote Desktop Services failures after installing September 2026 Patch Tuesday updates KB5122876 (Server 2019), KB5122882 (Server 2022), and KB5122871 (Server 2025), with connections hanging, sessions failing after logout, and some systems requiring hard resets. One administrator debugging Server 2022 observed an apparent deadlock between RDP and the Local Session Manager, though Microsoft has not confirmed a root cause. Rolling back the updates restores RDS functionality but removes this month's security fixes. Microsoft had not responded to inquiries at publication time.
- RDS failures reported across Windows Server 2019, 2022, and 2025 after September 2026 cumulative updates
- Failures often appear hours after boot or after the first user logout; hard resets sometimes required
- Rolling back the updates restores RDS but removes September security fixes
- One admin reported a suspected deadlock between RDP and Local Session Manager; Microsoft has not confirmed
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From the original article
2 min read at bleepingcomputer.com
Windows admins report that the September 2026 security updates are causing Remote Desktop Services (RDS) failures on Windows Server 2019, 2022, and 2025 servers, preventing users from connecting and, in some cases, requiring a hard reset to restore functionality. [...]
By Lawrence Abrams · bleepingcomputer.com
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