Microsoft: September updates cause RDS failures on Windows Server
Microsoft confirms September 2026 Patch Tuesday updates break Remote Desktop Services on Windows Server 2012+; Group Policy mitigations and rollback workarounds available.
Microsoft confirmed that September 2026 Patch Tuesday security updates cause Remote Desktop Services failures on Windows Server 2012 and later, plus Windows 10 and Windows 11. Symptoms include unstable RDS, RDP connection failures after several minutes, sign-in issues, servers hanging at 'Please wait for the Remote Desktop Configuration,' and unresponsive MMC, RDS Licensing Diagnoser, and File Explorer. Microsoft published per-version Group Policy mitigations (covering KBs such as KB5124008, KB5122880, KB5122878, KB5122871, KB5122882, KB5122876, KB5123099, KB5123065, KB5123066) and suggests restarting affected VMs. Rolling back the updates restores RDS functionality but removes this month's security fixes.
- September 2026 Patch Tuesday updates break RDS on Windows Server 2012 and later.
- Symptoms include RDP failures, sign-in issues, hanging servers, unresponsive MMC and File Explorer.
- Microsoft provides per-OS Group Policy mitigations; VM restart or update rollback are workarounds.
- Rolling back updates removes this month's security fixes, creating patch-gap risk.
From the original article
2 min read at bleepingcomputer.com
Microsoft has confirmed reports that the September 2026 security updates cause Remote Desktop Services (RDS) failures on Windows Server systems. [...]
By Sergiu Gatlan · bleepingcomputer.com
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