Announcing Windows 11 Insider Preview Build 25951 (Canary Channel)

Hello Windows Insiders, today we are releasing Windows 11 Insider Preview Build 25951 to the Canary Channel. We are releasing ISOs for this build – they can be downloaded here.

REMINDER: As builds released to the Canary Channel are “hot off the presses,” we will offer limited documentation for builds flighted to the Canary Channel including documenting only the most significant and highly impactful known issues. Please note that we will not publish a blog post for every flight – only when new features are available in a build.

What’s new in Build 25951

SMB NTLM Blocking

Starting with this build (Build 25951), the SMB client now supports blocking NTLM for remote outbound connections. This changes legacy behavior, where Windows SPNEGO would negotiate Kerberos, NTLM, and other mechanisms with the destination server to decide on a supported security package. NTLM in this case refers to all versions of the LAN Manager security package: LM, NTLM, and NTLMv2.

With this new…

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Juniya Sankara

I love everything to do with Microsoft Windows, and the new Windows 11 is great so far. I love to spend my time researching on how viruses and bacteria work in my personal lab. I also enjoy history and comics.