Developer – Windows 11 Insider Preview 25206.1000 rs_prerelease

It continues with the next build, is in the process of doing it…

Hello Windows Insiders, today we are releasing Windows 11 Insider Preview Build 25206 for the dev channel.


  • The build includes changes to the behavior of the SMB authentication rate limiter.
  • We’ve got a few changes and improvements, including bringing the updated Open With dialog to all Insiders on the Dev Channel, some Dynamic Refresh Rate (DRR) updates, and more.
  • This build also includes a number of fixes to improve the overall experience for Windows Insiders.
  • We’ve also added a new known issue for a bug we’re investigating that is impacting a subset of Insiders on the Dev Channel by updating to the latest builds.

What’s new?

SMB authentication rate limiting program behavior changes

The SMB authentication rate limiter in Insider Preview builds added an additional protection mechanism to the SMB Server service: it implements a delay between each failed NTLM authentication. That is, if an attacker previously sent 300 brute force attempts per second from a client for 5 minutes (90,000 passwords), the same number of attempts would now take at least 50 hours. The goal is to make a Windows client an unattractive target either when it’s in a workgroup or for its local accounts when joining a domain. Although the SMB server runs by default in all versions of Windows, it is not accessible by default unless you intentionally open the firewall or create an SMB customer share that opens the firewall.

As of build 25206, it is enabled by default and set to 2000 ms (2 seconds). Any invalid username or password sent to SMB now causes a 2 second delay by default on all editions of Windows Insiders. When first released to Windows Insiders, this protection mechanism was disabled by default. This behavior change was not made to Windows Server Insiders, it is still set to 0 by default.

changes and improvements


  • The updated Open With dialog is now available to all Windows Insiders on the Dev Channel.


  • Windows Insiders can now save power by using Dynamic Refresh Rate (DRR) on external displays! To enable this setting, you must have a 120+Hz monitor with VRR (Variable Refresh Rate) support and a WDDM 3.1 driver installed. To select a dynamic refresh rate, go to settings > System > advertisement > Extended display and make your selection below refresh rate.
    • Note: To get the latest GPU drivers for Windows Insiders, check for Windows updates by going to Settings > Windows Update and then selecting “Check for updates”. To find out which WDDM driver you have, go to Start > dxdiag > Display and look at the driver model under Driver.


  • The search on the File Explorer home page shows recent file activity for Cloud Files.


  • We’ll start by introducing a change to accept the use of clipboard history (WIN + V) for password fields. We’re starting to roll this out, so the experience isn’t available to all Insiders just yet.



  • OneDrive setup should no longer unexpectedly ask for setup permission every time you restart your PC.
  • Fixed a crashing Explorer.exe affecting some Insiders.


  • Fixed a settings crash that could occur when searching and selecting certain settings related to Narrator.


  • Fixed a high hit search crash affecting some Insiders in recent flights.


  • The Windows Sandbox window should now resize correctly when you align it to the side of the screen.
  • Fixed an issue that could cause a memory leak in Windows Error Reporting after certain crashes.
  • When focus is on the desktop, pressing ALT + F4 and Enter should now shut down your PC instead of having to first shift keyboard focus (as was required in recent flights).
  • The computer icon reappears in the Shut Down Windows dialog box.

NOTE: Some fixes mentioned here in Insider Preview Builds from the Dev Channel may find their way into Servicing Updates for the released version of Windows 11.

known problems


  • [NEU] We’re investigating an issue where the “Date, time, and time zone settings are incorrect” message is displayed incorrectly and is preventing the installation from continuing.
  • We’re investigating reports that audio has stopped working for some Insiders after upgrading to the latest flights.
  • We’re investigating reports of a few different apps crashing in recent builds.


  • We’re working on a fix for an issue where command bar items like copy, paste, and empty recycle bin unexpectedly don’t activate when they should.


  • We’re investigating some issues where uninstalling specific apps using Settings > Apps > Installed apps doesn’t work correctly.

[Tablet-optimierte Taskleiste]

  • The taskbar sometimes blinks when switching between desktop and tablet positions.
  • The transition of the taskbar to the touch-optimized version takes longer than expected when switching between desktop and tablet holding.
  • Using the left or right edge gestures may cause the widgets or Notification Center to overlap or appear cut off from the taskbar.
  • When you use the gesture at the bottom right edge to show quick settings, the taskbar sometimes gets stuck in the expanded state instead of exiting the collapsed state.
  • When there are no windows running on the desktop, the taskbar can sometimes collapse when it should be expanded.


  • In right-to-left display languages ​​such as Arabic, when the widget board expanded view is clicked, the content is animated outside of the view before resizing the widget board.
  • The notification badge number may be misaligned on the taskbar.

For developers

You can download the latest Windows Insider SDK at

SDK NuGet packages are now also listed in the NuGet gallery | WindowsSDK, which includes:

These NuGet packages provide more granular access to the SDK and better integration with CI/CD pipelines.

Via the Dev Channel

The Dev Channel receives builds that are long prep work from our engineers with features and experience, which may never be published when we try different concepts and get feedback. It’s important to remember that the builds we release to the Dev Channel should not be considered targeted to any specific version of Windows, and that the features included change over time, in Insider Builds or may be replaced, or may never be released to general customers beyond Windows Insiders. For more information, see this blog post about how we plan to use the Dev Channel to generate new ideas, work on long-run items, and control the status of individual features.

These aren’t always stable builds, and sometimes issues arise that block vital activity or require workarounds. It is important that you read the known issues listed in our blog posts as we document many of these issues on every flight.

Build counts are higher in the Dev Channel than the Windows 11 Preview builds in the Beta and Release Preview channels. You cannot switch from the Dev Channel to the Beta or Release Preview channels without performing a clean install back to the current version of Windows 11.

ALSO: Because the Dev and Beta channels represent parallel development paths for our engineers, there may be instances where features and experiences first appear in the Beta channel.

The desktop watermark you see in the lower-right corner of your desktop is normal for these pre-release versions.

Important insider links

  • Would you like to learn how we developed Windows 11? Visit our Inside Windows 11 websiteto hear and meet our engineering, design and research makers to share their insights and unique perspectives throughout this journey.
  • You can View our Windows Insider Program documentation here.
  • Check out flight hub for a full overview of which build is included in which Insider channel.

Amanda & Brandon

Hello Windows Insiders, today we are releasing Windows 11 Insider Preview Build 25206 to the Dev Channel. TL;DR The build includes changes to SMB authentication rate limiter behavior. W

The article is in German

Tags: Developer Windows Insider Preview rs_prerelease

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