Key Facts
Microsoft confirms that September 2026 security updates can cause Remote Desktop Services instability. BleepingComputer reports that the known issue affects Windows Server 2012 and later as well as Windows 10 and Windows 11.
Technical Details
Microsoft says affected environments can experience failed RDP connections, sign-in problems, or servers hanging at Remote Desktop Configuration. It also lists Microsoft Management Console, RDS Licensing Diagnoser, File Explorer, and Windows Update as potentially becoming unresponsive.
Impact & Mitigation
Microsoft provides Known Issue Rollback Group Policy packages for affected releases while it works on a permanent fix. Test the mitigation and weigh update removal carefully because it also removes security fixes.