Microsoft has confirmed that the September 2026 RDS failures affecting Windows Server systems were triggered by this month’s Patch Tuesday security updates, and has since issued out-of-band fixes to address the mess. The issue touches Windows Server 2012 and later, along with Windows 10 and Windows 11 devices.
The confirmation arrived via a release health update on Friday, following a wave of reports from Windows administrators who found that installing the September updates broke Remote Desktop Services (RDS) entirely. In some cases, servers had to be hard-reset just to regain basic functionality.
What the September 2026 RDS Failures Actually Look Like
Microsoft’s own description of the problem is fairly grim. ‘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”,’ the company said on Friday. The knock-on effects spread further: Microsoft Management Console (MMC), RDS Licensing Diagnoser, and File Explorer could all become unresponsive, and the Windows Update page itself might lock up and sit there spinning a loading indicator indefinitely.
For servers that had already started failing, the situation was worse. Existing Remote Desktop sessions might refuse to disconnect or log off properly, while fresh connection attempts would hang during the connection process before failing. Administrators were, in effect, locked out.
Out-of-Band Fixes and the VM Workaround Caveat
According to WinTips.org, Microsoft resolved the September 2026 RDS failures by releasing out-of-band updates on 14 September 2026. Those updates are the cleanest path forward for most environments.
While waiting for those fixes to land, Microsoft had published a Group Policy-based mitigation covering a broad range of affected versions, including Windows 11 26H1, 25H2, 24H2, and 23H2; Windows 10 21H2 and 22H2; and server releases from Windows Server 2012 through to Windows Server 2025. Each version maps to a specific KB article and Group Policy object, and the mitigations are intended for enterprise-managed devices handled by IT departments.
Microsoft also suggested that administrators who could not reach virtual machines via RDP might be able to temporarily restore connectivity by stopping and restarting the affected virtual machine. However, as Pro IT NW noted, that workaround is written specifically for virtual machines and is not a documented fix for physical RDS hosts. Organisations running RDS on physical hardware were left without an officially supported temporary remedy beyond the Group Policy mitigation or rolling back the updates entirely.
Rolling back is its own problem, of course. Removing the September updates does restore Remote Desktop functionality, but it also strips out all the security fixes that came with this month’s Patch Tuesday release, leaving systems exposed for however long it takes to apply the out-of-band patches.
A Recurring Problem for Microsoft
This is not the first time a Windows update cycle has taken down Remote Desktop at scale. Microsoft fixed a similar known issue that caused Remote Desktop and RDS connection failures in March 2025, itself triggered by Windows updates released since January 2025. The September 2026 RDS failures follow a recognisable pattern: a cumulative update ships with a bug that breaks RDS, administrators scramble, Microsoft acknowledges the issue, and an out-of-band fix eventually follows.
The breadth of affected versions this time around is worth noting on its own terms. A bug that spans from Windows Server 2012 all the way through to the current Windows 11 and Windows Server 2025 releases suggests the fault lies somewhere in shared RDS stack code rather than in anything version-specific. Windows Server 2012 reaches end of extended support in October 2026, which makes any disruption to its RDS functionality particularly awkward for organisations still running it while planning migrations.
For IT teams that applied the September updates and are now dealing with the fallout, the out-of-band patches released on 14 September 2026 are the recommended resolution. Those who cannot immediately apply them should deploy the relevant Group Policy mitigation for their Windows version, keeping in mind that the VM restart workaround does not cover physical RDS hosts.
