Which Windows devices may be affected by the NTLMv1-derived credential change?
Microsoft lists Windows 11 versions 24H2, 25H2 and 26H2, plus Windows Server 2025. The notice says the change can affect devices without Credential Guard that use MS-CHAPv2 for Wi-Fi, Ethernet or VPN single sign-on.
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Windows’ October NTLMv1 Change Could Break Old VPN and Wi-Fi Sign-InsMicrosoft’s October update tightens NTLMv1-derived SSO credentials on supported Windows versions. Find MS-CHAPv2 dependencies before VPN or Wi-Fi access fails.
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