Microsoft has confirmed reports that the September 2026 security updates cause Remote Desktop Services (RDS) failures on Windows Server systems.
According to a release health update on Friday, this known issue impacts Windows Server 2012 and later, as well as Windows 10 and Windows 11 devices.
This confirmation follows widespread reports from Windows admins that installing this month's Patch Tuesday updates prevents users from connecting and, in some cases, requires a hard reset to restore functionality.
"In some environments, RDS might become unstable, resulting in RDP connections failing after several minutes, sign-in issues, or servers hanging at 'Please wait for the Remote Desktop Configuration'," Microsoft said on Friday.
"Related tools, including Microsoft Management Console (MMC), RDS Licensing Diagnoser, and File Explorer might also become unresponsive. Additionally, the Windows Update page might stop responding and continuously display a loading indicator."
Affected users have also found that once a server starts failing, existing Remote Desktop sessions may not disconnect or log off properly, while new connection attempts may also fail after hanging during the connection process.