September Patch Tuesday Breaks Remote Desktop on Windows Servers
After September Patch Tuesday, Windows Server 2019/2022/2025 systems running Remote Desktop Services can experience freezes where new RDP connections hang and existing sessions can’t log off; symptoms appear hours after reboot and are linked to KB5122876/KB5122882/KB5122871, with Event IDs 20498 and 6005 pointing to a deadlock in the RDPSERVERBASE!WDLIB_Close routine. Microsoft hasn’t provided an official fix yet. Workarounds include rolling back the updates (where feasible), toggling a feature flag to disable faulty audio redirection, or forcing RDP to TCP only; admins should test patches on non-critical hosts and maintain rollback plans until an official fix is released.
