With the launch of Windows 11 Insider Preview Build 25951 (Canary), Microsoft has added a new security feature that lets admins block New Technology Lan Manager (NTLM) over the file-sharing protocol Server Message Block (SMB) to prevent password-cracking attacks.

More specifically, the SMB client supports blocking NTLM for remote outbound connections in a change to a legacy protocol that is no longer considered as secure.

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