Windows 11 Insider Preview 25393.1.230608 iso file
Windows 11 Insider Preview is now available to everyone. It’s been a journey building Windows 11. Thank you Windows Insiders for your energy and enthusiasm that helped create a new Windows experience that brings you closer to what you love, empowering productivity and inspiring creativity.
Windows 11 Insider Preview What’s new in Build 25381
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. Windows 11 Insider Preview 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.
SMB signing can reduce the performance of SMB copy operations. You can mitigate this with more physical CPU cores or virtual CPUs as well as newer, faster CPUs.
To see the current SMB signing settings, run the following PowerShell commands:
Get-SmbServerConfiguration | fl requiresecuritysignature
Get-SmbClientConfiguration | fl requiresecuritysignature
To disable the requirement for SMB signing in client (outbound to other device) connections, run the following
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PowerShell command as an elevated administrator:
Set-SmbClientConfiguration -RequireSecuritySignature $false
To disable the requirement for SMB signing in server (on Windows 11 Insider Preview Build 25381 and higher with Enterprise edition devices), run the following PowerShell command as an elevated administrator:
Set-SmbServerConfiguration -RequireSecuritySignature $false
No reboot is required but existing SMB connections will still use signing until they are closed.
For more information on this change, visit https://aka.ms/SMBSigningOBD.
Changes and Improvements
[General]
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.
Pop-up dialog with the recommendation to launch the automated Get Help troubleshooter to resolve camera issues.
Pop-up dialog with the recommendation to launch the automated Get Help troubleshooter to resolve camera issues.
For developers
You can download the latest Windows Insider SDK at aka.ms/windowsinsidersdk.
SDK NuGet packages are now also flighting at NuGet Gallery | WindowsSDK which include:
.NET TFM packages for use in .NET apps as described at aka.ms/windowsinsidersdk
C++ packages for Win32 headers and libs per architecture
BuildTools package when you just need tools like MakeAppx.exe, MakePri.exe, and SignTool.exe
These NuGet packages provide more granular access to the SDK and better integration in CI/CD pipelines.
SDK flights are now published for both the Canary and Dev Channels, so be sure to choose the right version for your Insider Channel.
Remember to use adaptive code when targeting new APIs to make sure your app runs on all customer machines, particularly when building against the Dev Channel SDK. Feature detection is recommended over OS version checks, as OS version checks are unreliable and will not work as expected in all cases.
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