In this article, we will talk about the latest Windows 11 Insider Preview Build from the Canary Channel, which is Build 25381.
Reminder: Canary Channel Builds are Builds with limited documentation and with a lot less stability.
SMB Signing Requirement Changes
Beginning with Windows 11 Insider Preview Build 25381 Enterprise editions, SMB signing is now required by default for all connections. This changes legacy behavior, where Windows 10 and 11 required SMB signing by default only when connecting to shares named SYSVOL and NETLOGON and where Active Directory domain controllers required SMB signing when any client connected to them. This is part of a campaign to improve the security of Windows and Windows Server for the modern landscape.
All versions of Windows and Windows Server support SMB signing. But a third-party might disable or not support it. If you attempt to connect to a remote share on a third-party SMB server that that does not allow SMB signing, you may receive the one of following error messages:
- 0xc000a000
- -1073700864
- STATUS_INVALID_SIGNATURE
- The cryptographic signature is invalid.
To resolve this issue, configure your third-party SMB server to support SMB signing. This is Microsoft’s official recommended guidance. Do not disable SMB signing in Windows or use SMB1 to work around this behavior (SMB1 supports signing but does not enforce it). An SMB device that does not support signing allows interception and relay attacks from malicious parties.
For more information on this change, visit https://aka.ms/SMBSigningOBD.
New Camera Notification
If a camera streaming issue is detected such as a camera failing to start or a closed camera shutter, a pop-up dialog will appear with the recommendation to launch the automated Get Help troubleshooter to resolve the issue.
UPDATE 6/6: Microsoft is starting to roll out Cumulative Update Build 25381.1200 (KB5027849). This update does not include anything new and is designed to test our servicing pipeline for builds in the Canary Channel.
For more information about this Build, you can check this article from the Microsoft Blog.
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