Windows 10 2019 LTSC: Update KB5003703 (June 15, 2021)

[German]As of the third Tuesday in June (June 15, 2021), Microsoft has also released the non-security update KB5003703. Here are some details about this update, which has been released for the Windows 10 Enterprise 2019 LTSC etc. and Windows Server 2019. A list of updates can be found on this Microsoft website. I have pulled out the details below.

Update KB5003703 for Windows 10 2019 LTSC etc.

Cumulative Preview Update KB5003703 raises the Windows 10 OS build to 17763.2028. The update is available for Windows 10 Enterprise 2019 LTSC, Windows 10 IoT Enterprise 2019 LTSC, Windows 10 IoT Core 2019 LTSC and Windows Server 2019.The update includes quality improvements but no new OS features. Here's the list of improvements, referred to by Microsoft as highlights: 

• Updates an issue that prevents certain screen reader apps from running.
• Updates an issue that might cause a VPN to fail.

The update not only fixes VPN bugs but also other problems. Below is the complete list of fixes and improvements.

• Addresses an issue that prevents sorting from working properly when using multiple versions of National Language Support (NLS) sorting.
• Addresses a performance issue in the MultiByteToWideChar() function that occurs when it is used in a non-English locale.
• Addresses an issue that fails to properly manage touch input related memory before a user session ends.
• Addresses an issue that causes Windows to stop working when it uses AppLocker to validate a file that has multiple signatures. The error is 0x3B.
• Addresses an issue that might cause BitLocker to go into recovery mode after updating the Trusted Platform Module (TPM) firmware. This occurs when the "Interactive logon: Machine account lockout Threshold" policy is set and there were incorrect password attempts.
• Addresses an issue that prevents certain screen reader apps from running when Hypervisor-protected code integrity (HVCI) is enabled.
• Addresses an issue that causes Windows to generate many AppLocker or SmartLocker success events.
• Improves the accuracy and efficiency of sensitive data analysis in the Microsoft 365 Endpoint data loss prevention (DLP) Classification Engine.
• Addresses an access violation issue in HTTP.sys that causes a stop error. This issue only occurs when you enable HTTP tracing or logging.
• Addresses an issue with the Internet Key Exchange (IKE) VPN service on remote access server (RAS) servers. Periodically, users cannot connect a VPN to the server over the IKE protocol. This issue might start several hours or days after restarting the server or restarting the IKEEXT service. Some users can connect while many others cannot connect because the service is in DoS Protection mode, which limits incoming connection attempts.
• Addresses an issue that might cause a VPN to fail after renewing a user auto-enrolled certificate. The error message is "There are no more files".
• Addresses a metadata encoding issue that causes Free Lossless Audio Codec (FLAC) music files to become unplayable if you change their title, artist, or other metadata. For more information, see FLAC encoded music file is corrupted when metadata is edited in Windows Explorer.
• Addresses an issue that causes Remote Desktop sessions to stop responding while the User Datagram Protocol (UDP) is enabled.
• Addresses an issue with an infinite loop in svchost.exe (TermService) that might cause high CPU usage.
• Addresses an issue in Adamsync.exe that affects the syncing of large Active Directory subtrees.
• Addresses an issue that might cause endless replication when you promote a new domain controller and the Active Directory Recycle Bin feature is enabled.
• Addresses an error that occurs when the Lightweight Directory Access Protocol (LDAP) bind cache is full, and the LDAP client library receives a referral.
• Addresses an issue that might cause a stop error when you run SmbConnectStress for a prolonged duration.
• Addresses a redirector stop error that is caused by a race condition that occurs when the system deletes binding objects when connections close.
• Addresses an issue that might damage the file system of some devices and prevent them from starting up after running chkdsk /f.
• Addresses an issue that causes the images and text that first appear when you open a RemoteApp to remain on the screen indefinitely.

This update is optional and is only downloaded and installed when a search is performed in Windows Update. However, it is also available in the Microsoft Update Catalog, but not via WSUS or Windows Update for Business. According to Microsoft, installing the LCU requires an existing Servicing Stack Update (SSU) (KB5003243) or the current SSU (KB5003711)). For the update, Microsoft cites several known issues in the support article. 

In addition, Microsoft has released an update directly for the Windows Update client to improve its reliability. This is rolled out outside of Windows Update if the machine is compatible and not an LTSC variant and updates have not been blocked via GPO.

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