Security News > 2023 > November > Microsoft drops SMB1 firewall rules in new Windows 11 build
Windows 11 will no longer add SMB1 Windows Defender Firewall rules when creating new SMB shares starting with today's Canary Channel Insider Preview Build 25992 build.
Before this change and since Windows XP SP2, creating SMB shares set up firewall rules automatically within the "File and Printer Sharing" group for the specified firewall profiles.
Following the introduction of Windows 11 Insider Preview Build 25982 in the Canary Channel, administrators can now enforce SMB client encryption for all outbound connections.
Admins can also configure Windows 11 systems to block sending NTLM data over SMB automatically on remote outbound connections to thwart pass-the-hash, NTLM relay, or password-cracking attacks, starting with the Windows 11 Insider Preview Build 25951.
With the Windows 11 Insider Preview Canary Build 25381, Redmond also started requiring SMB signing by default for all connections to defend against NTLM relay attacks.
Last year, in April, Microsoft revealed the final phase of disabling the decades-old SMB1 file-sharing protocol for Windows 11 Home Insiders.
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