September 2026 cumulative updates are causing Remote Desktop Services failures on Windows Server 2019, 2022, and 2025, leaving some systems unable to accept new connections and sometimes requiring a hard reset. Rolling back the updates appears to restore access, but it also removes the security fixes included in the Patch Tuesday release. #Microsoft #WindowsServer2019 #WindowsServer2022 #WindowsServer2025 #PatchTuesday
Keypoints
- September 2026 cumulative updates are breaking Remote Desktop Services on multiple Windows Server versions.
- Servers may work for hours before RDS sessions start failing.
- Existing sessions can hang during logoff or disconnect attempts.
- New Remote Desktop connections may stall and eventually fail.
- Rolling back the updates restores functionality but removes security fixes.