Microsoft Confirms September 2026 Patch Breaks Remote Desktop Services on Windows Server

Microsoft has officially acknowledged that the security updates released in September 2026 are causing Remote Desktop Services (RDS) to fail on Windows Server installations, confirming a wave of reports that surfaced earlier this month.

RDS is a core component of Windows Server that enables administrators and end users to access graphical desktops and applications over a network. It is widely used in enterprise environments for remote management, virtual desktop infrastructure, and third‑party remote access solutions.

The problem appears to be linked to a specific set of cumulative updates that were rolled out to address recent vulnerabilities. Administrators who applied the patches began seeing RDS sessions terminate abruptly, with error logs citing a “TermService” failure and, in some cases, a complete inability to start the service after a reboot.

Early feedback from IT teams indicates that the issue is affecting a range of Windows Server versions, from 2016 through 2022, and is disrupting operations that rely on remote access, such as remote troubleshooting, hosted application delivery, and cloud‑based desktop services. Some organizations reported that the failure forced them to revert to older backup servers or temporarily suspend remote work, highlighting the operational risk of a seemingly routine security update.

In a statement, Microsoft said it is investigating the root cause and has begun testing a remedial update. The company recommended that affected customers temporarily roll back the September patches or disable RDS until a fix is available, and it urged administrators to monitor the Windows Update Catalog for forthcoming guidance.

Industry analysts note that the incident underscores the delicate balance between rapid security patching and system stability, especially for critical infrastructure components. As Microsoft works on a corrective release, experts advise IT departments to maintain robust change‑management procedures, keep offline backups of server configurations, and consider staged deployments of future updates to mitigate similar disruptions.