Windows 11 KB5127648 breaks enterprise Wi-Fi; a Registry fix keeps it installed

Feeds.4Sysops •IT News • October 14, 2026

Windows 11 update KB5127648 is preventing some PCs from completing WPA2-Enterprise Wi-Fi authentication over 802.1X and PEAP, across systems with different wireless chipsets. A Registry change may restore access without uninstalling the update, but it re-enables legacy authentication behavior that Microsoft is phasing out. Source

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Windows Update KB5127648 Disrupts Wi-Fi and VPN Authentication Microsoft's October 2026 update KB5127648 has caused disruptions in Wi-Fi and VPN sign-ins for Windows 11 and Windows Server 2025. The update affects systems relying on MS-CHAPv2 and NTLMv1-derived credentials, particularly when Credential Guard is disabled. Users may experience issues with WPA2-Enterprise Wi-Fi authentication over 802.1X and PEAP, impacting various wireless chipsets. A temporary workaround is available by restoring Audit mode, but this reduces protection against legacy authentication methods. The issue is confirmed to affect Windows 11 versions 24H2, 25H2, and 26H2, as well as Windows Server 2025. Microsoft has not indicated any related to this update. 2 sources 31

Windows 11 KB5127648 breaks enterprise Wi-Fi; a Registry fix keeps it installed

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