Windows 10 and Windows 8.1 Updates (Feb. 25, 2020)

[German]On February 25, 2020, Microsoft released a monthly preview rollup for Windows 8.1 as well as optional updates for older Windows 10 versions.


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Updates for Windows 10

These are so-called C-Week Updates, which are released as optional updates in the third week of a month. A list of the updates can be found on this Microsoft website. I have extracted the details below. The update installation requires an existing current Servicing Stack Updates (SSUs). Microsoft now publishes an overview of current Servicing Stack Updates (SSUs) under ADV990001 (if it is not up to date, check the Microsoft Update Catalog for Servicing Stack Updates).

Update KB4537818 for Windows 10 Version 1809

Update KB4537818 raises the OS build (according to MS) to 17763.1075 and includes improvements and bug fixes but no new operating system features. Here is the list of improvements:

  • Addresses an issue that prevents the speech platform application from opening for several minutes in a high noise environment. 
  • Improves the accuracy of Windows Hello face authentication. 
  • Improves Urlmon resiliency when receiving incorrect Content-Length for a PeerDist response. 
  • Addresses an issue that might prevent ActiveX content from loading. 
  • Addresses an issue that might cause Microsoft browsers to bypass proxy servers. 
  • Improves the battery performance during Modern Standby mode. 
  • Addresses an issue that causes the power dependency coordinator (PDC) driver to unnecessarily drain the battery in certain scenarios. 
  • Addresses an issue that prevents a user from upgrading or uninstalling some Universal Windows Platforms (UWP) apps in certain scenarios. 
  • Addresses an issue that causes attempts to take a screenshot of a window using the PrintWindow API to fail. 
  • Addresses an issue that adds an unwanted keyboard layout as the default after an upgrade or migration even if you have already removed it. 
  • Addresses an issue that fails to return search results in the Start menu Search box for users that have no local profile. 
  • Addresses an issue that causes the installation process to stop when installing Windows on a VMware guest machine that has a USB 3.0 hub attached. 
  • Addresses an issue in which re-running PowerShell workflows might fail with compilation errors for long sessions. 
  • Improves Event Forwarding scalability to ensure thread safety and increase resources. 
  • Addresses an issue in the Windows activation troubleshooter that prevents users from reactivating their copy of Windows using the product key stored in their Managed Service Account (MSA). 
  • Addresses an issue that generates an “unknown username or bad password” error when attempting to sign in. This occurs in an environment that has a Windows Server 2003 domain controller (DC) and a Windows Server 2016 or later DC. 
  • Addresses an issue with sign in scripts that fail to run when a user signs in or signs out. 
  • Addresses an issue that continues to collect IsTouchCapable and GetSystemSku data when they should no longer be collected. 
  • Addresses an issue that might cause Direct Access servers to use a large amount of non-paged pool memory (pooltag: NDnd). 
  • Addresses an issue in which the WinHTTP AutoProxy service does not comply with the value set for the maximum Time To Live (TTL) on the Proxy Auto-Configuration (PAC) file. This prevents the cached file from updating dynamically. 
  • Addresses an issue that prevents some applications from printing to network printers. 
  • Addresses an issue that causes the wrong printer name to be selected when you click the Print button in the SQL reporting service.  
  • Addresses an issue that might cause a printer to be a hidden device in Device Manager after a restart. 
  • Addresses an issue that prevents the Background Intelligent Transfer Service (BITS) from downloading files; the error is “0x80190191.” 
  • Addresses an issue that causes the Windows firewall to drop network traffic from Modern apps, such as Microsoft Edge, when you connect to a corporate network using a virtual private network (VPN). 
  • Addresses an issue that causes Host Networking Service (HNS) PortMapping policies to leak when the container host is reinstated after a restart. 
  • Addresses an issue that causes some systems to stop responding when operating embedded MultiMediaCard (eMMC) storage devices. 
  • Addresses an issue that occurs when you try to sign in to Windows during recovery mode. The error, “No administrator accounts are available on this machine”, appears. 
  • Addresses an issue that prevents you from removing some local users from local built-in groups. For example, you cannot remove “Guest” from the “Guests” local group. 
  • Addresses an issue that causes the Local Security Authority Subsystem Service (LSASS) to stop working and triggers a restart of the system. This issue occurs when invalid restart data is sent with a non-critical paged search control. 
  • Addresses an Open Database Connectivity (ODBC) issue that causes an infinite loop in the retry logic when there are several lost connections in the connection pool. 
  • Addresses an issue that causes queries against large keys on Ntds.dit to fail with the error, “MAPI_E_NOT_ENOUGH_RESOURCES.” This issue might cause users to see limited meeting room availability because the Exchange Messaging Application Programming Interface (MAPI) cannot allocate additional memory for the meeting requests.
  • Addresses an issue that intermittently generates Online Certificate Status Protocol (OSCP) Responder audit events (5125) to indicate that a request was submitted to the OCSP Responder Service. However, there is no reference to the serial number or the domain name (DN) of the issuer of the request. 
  • Addresses an issue that prevents Server Message Block (SMB) Multichannel from working within a cluster network that has IPv6 Local-Link addresses. 
  • Addresses an issue that might cause Storage Migration Service inventory operations on a Windows Server 2003 source computer to fail in clustered environments.
  • Addresses an issue in which canceling a deduplication (dedup) job to rebuild hotspots prevents other deduplication PowerShell commands from responding. 
  • Addresses an issue that causes window ordering to fail after displaying tooltips in the RemoteApp window. 
  • Addresses an issue in which the Remote Desktop (RD) Licensing Diagnoser shows an incorrect version of the Remote Desktop Session Host (RDSH) and the Remote Desktop Licensing Server (RDLS).
  • Addresses an issue with certificate validation that causes Internet Explorer mode in Microsoft Edge to fail.

At a glance I noticed fixes for the update error 0x8019019 in the BITS service, as well as for printing problems (printers disappear). Also an ODBC error was corrected.

This update is optional and can only be downloaded and installed after a search in Windows Update. This update is also available in the Microsoft Update Catalog. Microsoft strongly recommends that you install the latest service stack update (SSU) for your operating system before you install the latest cumulative update (LCU). Microsoft lists several known issues that this update causes. For details, see the KB article.

Microsoft has also released an update directly to 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 are not blocked by GPO

Updates for Windows 10 Version 1507 till 1803

For Windows 10 RTM up to version 1803, various updates are available for the LTSC versions and, if necessary, the Enterprise versions. The Home and Pro versions, however, have been dropped from support. Here is a short overview. 


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  • Windows 10 Version 1803: Update KB4537795 is only available for Enterprise and Education. The update raises the OS build to 17134.1345. The fixes mentioned in the KB article are included. This update is automatically downloaded and installed by Windows Update, but is available for download from the Microsoft Update Catalog. Before manual installation, the latest Servicing Stack Update (SSU) must be installed. Details, including known issues, can be found in the KB article.
  • Windows 10 Version 1709: Update KB4537816 is only available for Enterprise and Education. The update raises the OS build to 16299.1717. The fixes mentioned in the KB article are included. This update is automatically downloaded and installed by Windows Update, but is available for download from the Microsoft Update Catalog. Before manual installation, the latest Servicing Stack Update (SSU) must be installed. Details, including known issues, can be found in the KB article.
  • Windows 10 Version 1607: Update KB4537806 is now available only to Enterprise LTSC. The update raises the OS build to 14393.3542. The fixes mentioned in the KB article are included. This update is automatically downloaded and installed by Windows Update, but is available for download from the Microsoft Update Catalog. Before manual installation, the latest Servicing Stack Update (SSU) must be installed. Details, including known issues, can be found in the KB article.

There was no update for other Windows 10 versions. In case of doubt, details about the above updates can be found in the respective Microsoft KB articles

Updates for Windows 8.1/Windows Server 2012 R2

For Windows 8.1 and Windows Server 2012 R2 a Preview Monthly Rollup has been released. The update history for Windows 8.1 can be found on this Microsoft page.

KB4537819 (Monthly Rollup) for Windows 8.1/Server 2012 R2

Update KB4537819 (Preview of Monthly Rollup for Windows 8.1 and Windows Server 2012 R2) contains improvements and fixes from the latest updates and a preview of the March 2020 updates. The preview update addresses the following issues. 

  • Addresses an issue that might prevent ActiveX content from loading.
  • Addresses an issue that causes a system to stop responding when unmounting a volume.

This update is offered and installed via Windows Update, but is also available in the Microsoft Update Catalog and via WSUS. In case of a manual installation, the latest Servicing Stack Update (SSU KB4524445) must be installed before. 

It’s not know, whether this update fixes the issue described in article Windows 8.1: Update KB4537821 kills also user profiles has been fixed. The update also has a know issue.

Certain actions, such as renaming, that you perform on files or folders that are located on a cluster shared volume (CSV) may be affected by the

“STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5)”

fail. This occurs when you perform the action on a CSV owner node from a process that does not have administrator rights.

See the KB article for details.

Similar articles:
Patchday Windows 10-Updates (February 11, 2020)
Patchday: Updates for Windows 7/8.1/Server (Feb. 11, 2020)
Patchday Microsoft Office Updates (February 11, 2020)
Windows 10: Update KB4524244 pulled


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