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mediumWindowsbreaking changem365_message_center · Oct 15, 2026
Take action: NTLMv1 hardening changes might affect network connections on devices without Credential Guard
Windows will enforce restrictions on generating NTLMv1-derived credentials, which may affect network connections on devices without Credential Guard. This change is part of Microsoft’s effort to phase out NTLM and improve security.
“Services: Windows. <div>Beginning with the October 2026 security update, Windows 11, versions 26H2, 25H2, and 24H2, along with Windows Server 2025 enforce restrictions on generating NTLMv1-derived credentials for Single Sign-On by default. This planned security-hardening change is part of the boarder Microsoft effort…”
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endpoint_securitythreat_protection
Audience
adminsecurity_engineer
Environment
cloudon_premises
Classification confidence: 90%
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