Windows 11 (build 25206) is coming to the Insider Program developer channel

In another week, this time with a slight delay, we present you with a new build available on the Dev channel. This time we’re moving from build 25201 to build 25206. It doesn’t have many new features, but some bugs have been fixed. Let’s take a look at what the Windows Insider team did.

What’s new in Windows 11 build 25206

SMB Authentication Restrictor Behavior Changes

The SMB authentication rate limiter in the Insider Preview builds has added an additional security mechanism to the SMB Server service by implementing a delay between each NTLM authentication failure. This indicates that if the attacker previously sent 300 brute force attempts per second from the client for 5 minutes (90,000 passwords), now it will take at least 50 hours for the same number of attempts. The goal here is to make the Windows client an unattractive target, whether in a workgroup or for your local accounts when joining a domain. Although the SMB server runs by default on all versions of Windows, it is not available by default unless you intentionally open the firewall or create an SMB client share that opens the firewall.

As of build 25206, it is enabled by default and set to 2000ms (2 seconds). Any invalid username or password sent in SMB now causes a default 2 second delay 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 for Windows Server Insiders, it still has a default value of 0.

Changes and improvements in build 25206


  • The updated Open With dialog box is now available to all Windows Insiders in 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 VRR (Variable Refresh Rate) capable 120+Hz monitor and have the WDDM 3.1 driver installed. To select a dynamic refresh rate, go to Settings > System > Display > Advanced Display and make your choice under Refresh Rate.
    Note. To get the latest GPU drivers available to Windows Insiders, check for Windows updates by going to Settings > Windows Update and selecting Check for Updates. To find out which WDDM driver you have, go to Start > dxdiag > Display and find the driver model under Drivers.

File browser

  • Searching the File Explorer home page will show recent cloud file activity in the Details view.


  • They are starting to roll out a change to support the use of clipboard history (WIN+V) in password fields. They’re starting to roll it out, so the experience isn’t available to all insiders just yet.

Build 25206 fixes


  • OneDrive settings should no longer unexpectedly ask for permission to self-configure every time you restart your PC.
  • Fixed Explorer.exe crash affecting some users.


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

Research work

  • Fixed a search bug affecting some users in recent updates.


  • The Windows Sandbox window should now properly resize when it fits on one side of the screen.
  • We fixed an issue that could cause memory leaks in Windows Error Reporting after certain crashes.
  • If the focus is on the desktop, now press ALT + F4 and Enter to shut down the computer, instead of moving the keyboard focus first (as was necessary in recent builds).
  • The computer icon reappears in the Shut Down Windows dialog box.

Known Issues in Build 25206


  • NEW! They’re investigating an issue that incorrectly displays the “incorrect date, time, and time zone settings” message, preventing installation from continuing.
  • NEW! Using the Reset this PC option to reset your PC will break UWP apps after the reset. If you need to reset your device to version 25201 or later, manually back up the files and use the latest ISO available at to perform a clean install.
  • They are investigating reports that audio has stopped working for some Insiders after updating to the latest version.
  • They are investigating reports of several different apps that have started to crash in recent versions.

File browser

  • We’re working on a fix for an issue where command bar items such as copy, paste, and empty trash may unexpectedly not activate when they should.


  • They are investigating some issues where uninstalling certain apps through Settings > Apps > Installed Apps doesn’t work as expected.

Taskbar optimized for tablets

  • The taskbar sometimes flickers when switching from desktop mode to tablet mode.
  • The taskbar takes longer than expected to switch to the touch version when switching between desktop position and tablet position.
  • Using left or right edge gestures may cause the taskbar to overlap or clip widgets or the notification center (respectively).
  • When using the bottom right edge gesture to access quick settings, the taskbar sometimes freezes in an expanded state instead of appearing in a minimized state.
  • When no windows are running on the desktop, the taskbar can sometimes collapse when it should be maximized.


  • In right-to-left languages, such as Arabic, the content animates out of view until the widget table is resized when you click the extended view of the widget table.
  • In some cases, the notification banner for certain icons will not appear on the widget bar.

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