Microsoftは本日、Windows 11のプレビュービルド「Windows 11 Insider Preview Build 25206」をWindows Insider ProgramのDevチャンネル向けにリリースしました(Windows Blog)。
本ビルドの注目点は以下の通りです。
- SMB認証のレートリミッターの動作の変更。
- アップデートされた「開く(Open with)」ダイアログ、ダイナミックリフレッシュレート(DRR)に関するアップデートなど、いくつかの変更と改良。
- Windows Insiderの全体的な体験を向上させるための一連の修正。
- 一部のユーザーが最新ビルドにアップデートできない既知の不具合を追加。
Devチャンネルで公開されるビルドは、将来の機能アップデートで追加される可能性のある、さまざまな新機能が先行して実装されています。特定のリリースとは直接結びつけられておらず、ビルドに含まれる新機能や改善点は、準備が整い次第、将来のWindowsリリースに反映される可能性があります。
Windows Insider Programの更新オプションでDevチャンネルを選択し、Windows 11のプレビュー版を使用しているユーザーは、Windows Updateを利用して最新版に更新することができます。
Build 25206の新機能
Build 25206の新機能は以下の通りです。
SMB認証のレートリミッターの動作変更
SMB認証レートリミッターは、SMBサーバーサービスに追加の保護メカニズムを追加する。NTLM認証に失敗するたびに遅延させることで、以前、攻撃者がクライアントから毎秒300回のブルートフォース攻撃を5分間(9万パスワード)行った場合と同じ回数の試行のために50時間かかることになる。Build 25206から、デフォルトでオンになり、2000ms(2秒)に設定されてる。
その他、アップデートされた「開く(Open with)」ダイアログの全インサイダーに対する展開や、ダイナミックリフレッシュレート(DRR)の外部ディスプレイへの対応といった変更も行われています。
変更点は以下の通りです。
[General]
- The updated “Open with” dialog box is now available to all Windows Insiders in the Dev Channel.
[Graphics]
- 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, as well as a WDDM 3.1 driver installed. To select a dynamic refresh rate, go to Settings > System > Display > Advanced display and make your selection under Refresh rate.
- Note: To get the latest GPU drivers available for Windows Insiders, check for Windows updates by going to Settings > Windows Update, then select “Check for updates”. To find out what WDDM driver you have, go to Start > dxdiag > Display and look at the Driver Model under Drivers.
[File Explorer]
- Search from File Explorer Home will show recent file activity for cloud files.
[Input]
- We’re beginning to roll out a change to suppose the use of clipboard history (WIN + V) on password fields. We are beginning to roll this out, so the experience isn’t available to all Insiders just yet.
修正点は以下の通りです。
[General]
- OneDrive setup should no longer unexpectedly ask for permission to set up every time your PC reboots.
- Fixed a high hitting explorer.exe which was impacting some Insiders.
[Settings]
- Fixed a Settings crash which could happen when searching and selecting certain Narrator related settings.
[Search]
- Fixed a high hitting search crash which was impacting some Insiders in the last few flights.
[Other]
- The Windows Sandbox window should now resize correctly if you snap it to the side of the screen.
- Fixed an issue which could lead to a memory leak in Windows Error Reporting after certain crashes.
- If focus is on the desktop, then pressing ALT + F4 and Enter should now shutdown your PC, rather than having to move keyboard focus first (as was needed in the last few flights).
- The computer icon is now showing again in the Shut Down Windows dialog.
NOTE: Some fixes noted here in Insider Preview builds from the Dev Channel may make their way into the servicing updates for the released version of Windows 11.
以下の既知の不具合が存在します。
[General]
- [NEW] We are investigating an issue where a “date, time and time zone settings are incorrect” message is improperly displayed and prevents the installation from proceeding further.
- We’re looking into reports that audio stopped working for some Insiders after upgrading to the latest flights.
- We’re investigating reports of a few different apps having started crashing in recent builds.
[File Explorer]
- We’re working on the fix for an issue where command bar items like copy, paste, and empty recycle bin may unexpectedly not be enabled when they should be.
[Settings]
- We’re investigating some issues where uninstalling certain apps using Settings > Apps > Installed apps isn’t working correctly.
[Tablet-optimized taskbar]
- The taskbar sometimes flashes when transitioning between desktop posture and tablet posture.
- The taskbar takes longer than expected to transition to the touch-optimized version when switching between desktop posture and tablet posture.
- Using the left or right edge gestures can result in the Widgets or Notification Center (respectively) to overlap with or look truncated by the taskbar.
- When using the bottom right edge gesture to see Quick Settings, the taskbar sometimes stays stuck in the expanded state, instead of dismissing to collapsed state.
- When there are no running windows on the desktop, the taskbar can sometimes collapse, when it should be expanded.
[Widgets]
- In right-to-left display languages like Arabic, content animates out of view before the widgets board resizes when clicking to expanded view of the widgets board.
- Notification badge number may appear misaligned on the taskbar.
公式ブログには細かな修正内容がリストアップされていますので、インストールする前に確認することをおすすめします。