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Windows 10 update KB5006738 for 21H2, 21H1 (preview)

Windows 10 gets a non-security update to address a bunch of problems, and here's what you need to know.

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  • Windows 10 update KB5006738 releases for versions 21H2 and 21H1.
  • The update is available in the Release Preview Channel.
  • The KB5006738 update brings better data transfer between browsers and various fixes.

As part of the update release “C,” Microsoft has announced the update KB5006738 in the Release Preview Channel for devices running Windows 10 21H2 and 21H1. This is a non-security update available as an optional install to address several problems with the two more recent releases of Windows 10.

The update KB5006738 bumps the version number to build 19044.1319 and 19043.1319 for Windows 10 21H2 and 21H1. According to the announcement (link 2), this preview brings a feature to make it easier to transfer data between web browsers. It also addresses problems with subtitles, VPN connection to Windows Server 2019, and other VPN-related issues. The update KB5006738 fixes issue with BitLocker, a Lock screen with a blank screen, a memory leak, and a virtual machine (VM) Load Balancing feature.

Update KB5006738 fixes and changes

These are the fixes with the latest update preview of Windows 10:

  • Fixed an issue that prevents you from accessing the pre-provisioning page during the out-of-box experience (OOBE). This issue occurs when the credentials page for signing in to Azure Active Directory appears, and you press the Windows key five times.
  • We added a feature that facilitates certain cross-browser data transfers.
  • Addressed a problem with Assigned Access kiosks that are configured with Microsoft Edge as a kiosk application. These kiosks might sometimes fail to restart Microsoft Edge if users close the browser window.
  • Fixed an issue in which the use of App-V intermittently causes black screens to appear when signing in on the credentials page.
  • Addressed a problem that might prevent subtitles from displaying for certain video apps and streaming video sites.
  • Fixed an issue that prevents Windows 10 virtual private network (VPN) users from connecting to Windows Server 2019 Routing and Remote Access service (RRAS) servers.
  • Addressed a problem that prevents Software-Defined Networking (SDN) virtual machines from working when you configure the Generic Routing Encapsulation (GRE) VPN bandwidth limitation.
  • We fixed a Primary Refresh Token (PRT) update issue that occurs when VPN users sign in using Windows Hello for Business when the VPN connection is offline. Users receive unexpected authentication prompts for online resources that are configured for user sign-in frequency (SIF) in Azure Active Directory-Conditional Access.
  • Fixed an issue that causes Windows to go into BitLocker recovery after a servicing update.
  • Addressed a problem that might cause Kerberos.dll to stop working within the Local Security Authority Subsystem Service (LSASS). This occurs when LSASS processes simultaneous Service for User (S4U) user-to-user (U2U) requests for the same client user.
  • Fixed an issue in Code Integrity that might cause a memory leak.
  • We enhanced Microsoft Defender for Endpoint’s ability to identify and intercept ransomware and advanced attacks.
  • Addressed a problem in the OOBE that might cause Windows AutoPilot provisioning to fail.
  • Fixed an issue that prevents Kana input mode users from inserting a question mark (?) using the Shift-0 key combination.
  • Addressed a problem that sometimes causes the lock screen to appear black if you enable slideshow.
  • We fixed a reliability issue with LogonUI.exe, which affects the rendering of the network status text on the credentials screen.
  • Fixed an issue that causes Server Message Block (SMB) Query Directory Requests to fail when the buffer size is large.
  • We fixed a memory leak issue in lsass.exe on domain controllers in the forest root domain that occurs when you have multiple forests and multiple domains in each forest. The SID-Name mapping functions leak memory when a request comes from another domain in the forest and crosses forest boundaries.
  • Fixed an issue with the virtual machine (VM) Load Balancing feature, which ignores a site’s fault domain.

In addition, the company is also releasing the update KB5006744 for Windows 10 1809, which bumps the version number to build 17763.2268 and addresses a bunch of problems.

About the author
Avatar for Mauro Huculak

Mauro Huculak is a Windows expert and the Editor-in-Chief who started Pureinfotech in 2010 as an independent online publication. He is also been a Windows Central contributor for nearly a decade. Mauro has over 12 years of experience writing comprehensive guides and creating professional videos about Windows, software, and related technologies, including Android and Linux. Before becoming a technology writer, he was an IT administrator for seven years. In total, Mauro has over 20 years of combined experience in technology. Throughout his career, he achieved different professional certifications from Microsoft (MSCA), Cisco (CCNP), VMware (VCP), and CompTIA (A+ and Network+), and he has been recognized as a Microsoft MVP for many years. You can follow him on X (Twitter), YouTube, LinkedIn and About.me.