Microsoft September 2026 Updates Reported to Disrupt Always On VPN Connections on Windows 11

Microsoft warned that the September 2026 security updates may also break Always On VPN connections on some Windows 11 systems. According to BleepingComputer, users applying the monthly cumulative updates may lose VPN connectivity, impacting remote access and network functionality. The issue is described as a compatibility break introduced by the updates, not an active exploitation of a security flaw. Microsoft has not published an official advisory at the time of reporting, and affected users are advised to monitor official release notes and support channels for a resolution or workaround. No specific build numbers or KB articles have been confirmed as the root cause. The scope of impacted devices remains unclear, and Microsoft is expected to release a fix or guidance in the coming days.