Is the Windows October NTLMv1 behavior a newly discovered update bug?
Microsoft describes the restriction as a planned security-hardening change, not a known issue with the October 2026 update. It is part of the broader effort to phase out NTLM.
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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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