Windows 10 update settings with purple background

Windows 10 update KB4601380 outs for version 1909

Windows 10 versions 1909 and 1809 get a preview of the Patch Tuesday update expected to arrive in March 2021.

Microsoft has made available the update KB4601380 for devices still on Windows 10 version 1909. The update is ready for download as a preview, meaning that it is an optional update to address several non-security issues with this version of the operating system.

The update KB4601380 bumps the version number to 18363.1411, and according to the changelogs, fixes problems with Input Method Editor (IME), fonts rendering, and screen rendering in certain hardware configurations.

In addition to the preview for version 1909, the software giant is also making available the update KB4601383 for Windows 10 version 1809 to address similar problems with this particular release.

Update KB4601380 for Windows 10 1909

The update KB4601380 has been published on the Windows support site, and it is referred to as “February 16, 2021—KB4601380 (OS Build 18363.1411) Preview.” If you are still in the Windows 10 November 2019 Update, this update will address these issues:

  • Updates the default values for the following Internet Explorer registry keys: svcKBFWLink = “ ” (empty string), svcKBNumber = “ ” (empty string), svcUpdateVersion = 11.0.1000. In addition, these values will no longer be updated automatically.
  • Addresses an issue with a memory leak in Internet Explorer 11 that occurs when you use the Chinese language pack.
  • Fixes a problem with certain COM+ callout policies that cause a deadlock in certain applications.
  • Addresses an issue that renders fonts incorrectly.
  • Fixes a problem that sometimes prevents the input of strings into the Input Method Editor (IME).
  • Addresses an issue with the SetWindowRgn API. It incorrectly sets the window region’s coordinates relative to the client area instead of relative to the upper-left corner of the window. As a result, users cannot maximize, minimize, or close a window.
  • Fixes a problem with a stop error that occurs at startup.
  • Removes the history of previously used pictures from a user account profile.
  • Addresses an issue that might delay a Windows Hello for Business (WHfB) Certificate Trust deployment when you open the “Sign-in Options” page.
  • Fixes a problem that causes the host process of Windows Remote Management (WinRM) to stop working when it formats messages from a PowerShell plugin.
  • Addresses an issue in the Windows Management Instrumentation (WMI) service that causes a heap leak each time security settings are applied to WMI namespace permissions.
  • Fixes a problem with screen rendering after opening games with certain hardware configurations.
  • Improves startup times for applications that have roaming settings when User Experience Virtualization (UE-V) is turned on.
  • Addresses an issue that prevents the Trusted Platform Module (TPM) from starting. As a result, TPM-based scenarios do not work.
  • Fixes a problem in which a principal in a trusted MIT realm fails to obtain a Kerberos service ticket from Active Directory domain controllers (DC). 
  • Addresses high memory and CPU utilization in Microsoft Defender for Endpoint.
  • Enhances data loss prevention and insider risk management solution functionalities in Microsoft 365 endpoints.
  • Addresses an issue with the x86 version of Microsoft Excel 365 Version 2011. It fails to open if you enable the SimExec feature of Defender Exploit Protection or stops working if you disable the SimExec exploit protection and enable the CallerCheck protection.
  • Fixes a problem that displays an error when you attempt to open an untrusted webpage using Microsoft Edge or open an untrusted Microsoft Office document. The error is, “WDAG Report – Container: Error: 0x80070003, Ext error: 0x00000001”. This issue occurs after installing the .NET update KB4565627.
  • Addresses an issue that prevents wevtutil from parsing an XML file.
  • Fixes a problem that fails to report an error when the Elliptic Curve Digital Signature Algorithm (ECDSA) generates invalid keys of 163 bytes instead of 165 bytes.
  • Adds support for using the new Chromium-based Microsoft Edge as the assigned access single kiosk app. Now, you can also customize a breakout key sequence for single app kiosks. For more information, see Configure Microsoft Edge kiosk mode.
  • Addresses an issue with User Datagram Protocol (UDP) broadcast packets that are larger than the maximum transmission unit (MTU). Devices that receive these packets discard them because the checksum is not valid.
  • Fixes a problem 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.
  • Improves the ability of the WinHTTP Web Proxy Auto-Discovery Service to ignore invalid Web Proxy Auto-Discovery Protocol (WPAD) URLs that the Dynamic Host Configuration Protocol (DHCP) server returns.
  • Addresses an issue that might cause the IKEEXT service to stop working intermittently.
  • Fixes a problem with updating to Windows Server 2019 using a .iso image. If you renamed the default administrator account, the Local Security Authority (LSA) process might stop working.
  • Addresses an issue that might cause stop error 7E in nfssvr.sys on servers running the Network File System (NFS) service.
  • Fixes a problem that prevents the User Profile Service from detecting a slow or a fast link reliably.
  • Addresses an issue that causes contention for a metadata lock when using Work Folders.
  • Fixes a problem that causes a Work Folder sync to fail with the error code 0x8007017c if you have turned on On-Demand File Access.
  • Updates the Open Mobile Alliance (OMA) Device Management (DM) sync protocol by adding a check-in reason for requests from the client to the server. 
  • Addresses an issue with failover in an environment that only has IPv6 clusters. If the failover cluster has been running for more than 24 days, attempts to do a failover might not succeed or might be delayed.
  • New dfslogkey in HKEY_LOCAL_MACHINE/SOFTWARE/MICROSOFT/dfslog. The RootShareAcquireSuccessEvent field has the following possible values, including a default value of 1 to enable the log, and a value other than 1 disables the log.

Update KB4601383 for Windows 10 1809

Microsoft has also announced KB4601383 on the Windows support site, and it is referred to as “February 16, 2021-KB4601383 (OS Build 17763.1790) Preview.” If you have the Windows 10 October 2018 Update on your device, this update will address these issues:

  • Fixes an issue that renders fonts incorrectly.
  • Addresses a problem that sometimes prevents the input of strings into the Input Method Editor (IME).

You can check all the fixes and changes at the Microsoft support site.

Download February 2021 update for Windows 10

These updates are available immediately, and you can always force the update from Settings Update & Security > Windows Update, clicking the Check for updates button, and clicking the View optional updates option to select and download the update.

About the author

Mauro Huculak is a Windows How-To Expert who started Pureinfotech in 2010 as an independent online publication. He has also been a Windows Central contributor for nearly a decade. Mauro has over 15 years of experience writing comprehensive guides and creating professional videos about Windows and software, including Android and Linux. Before becoming a technology writer, he was an IT administrator for seven years. In total, Mauro has over 21 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 Email him at [email protected].