Microsoft releases February 2021 Windows non-security preview "C" patches for some Windows 10 versions. Those are new optional updates for Windows 10, version 1909 / 1903 and 1809. Microsoft also said that the preview update for Windows 10, version 20H2 and Windows 10, version 2004 will be available in the near term. 
As the update is tagged as Preview, only the users who click the Check for updates button manually will see these 'Preview' updates. Otherwise they won't be installed automatically.
The February 2021 monthly "C" release preview updates are now available for Windows 10, version 1909, and Windows 10, version 1809. https://t.co/0TjO1ENcGP
Advertisеment
— Windows Update (@WindowsUpdate) February 17, 2021
Here are the changes.
Windows 10, version 1909, KB4601380 (OS Build 18363.1411) Preview
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.
- Addresses an issue with certain COM+ callout policies that cause a deadlock in certain applications.
- Addresses an issue that renders fonts incorrectly.
- Addresses an issue 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.
- Addresses an issue 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 Settings-> Accounts-> Sign-in Options page.
- Addresses an issue 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.
- Addresses an issue 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.
- Addresses an issue in which a principal in a trusted MIT realm fails to obtain a Kerberos service ticket from Active Directory domain controllers (DC). This occurs on devices that installed Windows Updates that contain CVE-2020-17049 protections and configured PerfromTicketSignature to 1 or higher. These updates were released between November 10, 2020 and December 8, 2020. Ticket acquisition also fails with the error, “KRB_GENERIC_ERROR”, if callers submit a PAC-less Ticket Granting Ticket (TGT) as an evidence ticket without providing the USER_NO_AUTH_DATA_REQUIRED flag.
- 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.
- Addresses an issue 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.
- Addresses an issue 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.
- 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.
- 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.
- Addresses an issue 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.
- Addresses an issue 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.
- Addresses an issue 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. The check-in reason will allow the mobile device management (MDM) service to make better decisions about sync sessions. With this change, the OMA-DM service must negotiate a protocol version of 4.0 with the Windows OMA-DM client.
- 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.
- Adds a new dfslogkey as described below:
- Keypath: HKEY_LOCAL_MACHINE/SOFTWARE/MICROSOFT/dfslog.
- The RootShareAcquireSuccessEvent field has the following possible values:
- Default value = 1; enables the log.
- Value other than 1; disables the log.
If this key does not exist, it will be created automatically. To take effect, any change to
dfslog/RootShareAcquireSuccessEvent in the registry requires that you restart the DFSN service.
Windows 10, version 1809, KB4601383 (OS Build 17763.1790) Preview
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.
- Turns off token binding by default in Windows Internet (WinINet).
- Addresses an issue that displays a User Account Control (UAC) dialog box unexpectedly when you turn on speech recognition.
- Addresses an issue with certain COM+ callout policies that cause a deadlock in certain applications.
- Addresses an issue that renders fonts incorrectly.
- 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.
- Addresses an issue that sometimes prevents the input of strings into the Input Method Editor (IME).
- Removes the history of previously used pictures from a user account profile.
- Addresses an issue that displays the wrong language when you sign in to a console after you change the system locale.
- Addresses an issue 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.
- 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.
- Addresses an issue with unsigned program files that will not run when Windows Defender Application Control is in Audit Mode, but will allow unsigned images to run.
- Addresses an issue with Key Distribution Center (KDC) code, which fails to check for an invalid domain state when the domain controller restarts. The error message is “STATUS_INVALID_DOMAIN_STATE”.
- Addresses an issue in which a principal in a trusted MIT realm fails to obtain a Kerberos service ticket from Active Directory domain controllers (DC). This occurs on devices that installed Windows Updates that contain CVE-2020-17049 protections and configured PerfromTicketSignature to 1 or higher. These updates were released between November 10, 2020 and December 8, 2020. Ticket acquisition also fails with the error, “KRB_GENERIC_ERROR”, if callers submit a PAC-less Ticket Granting Ticket (TGT) as an evidence ticket without providing the USER_NO_AUTH_DATA_REQUIRED flag.
- 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.
- Addresses an issue 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.
- Addresses an issue that fails to report an error when the Elliptic Curve Digital Signature Algorithm (ECDSA) generates invalid keys of 163 bytes instead of 165 bytes.
- 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.
- Addresses an issue that might cause the IKEEXT service to stop working intermittently.
- Addresses an issue 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 causes a cluster disk to go offline, and the cluster log reports the error, “RPC_X_BAD_STUB_DATA”.
- Addresses an issue that might cause stop error 7E in nfssvr.sys on servers running the Network File System (NFS) service.
- Addresses an issue 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.
- Addresses an issue 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. The check-in reason will allow the mobile device management (MDM) service to make better decisions about sync sessions. With this change, the OMA-DM service must negotiate a protocol version of 4.0 with the Windows OMA-DM client.
- 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.
- Adds a new dfslogkey as described below:
- Keypath: HKEY_LOCAL_MACHINE/SOFTWARE/MICROSOFT/dfslog.
- The RootShareAcquireSuccessEvent field has the following possible values:
- Default value = 1; enables the log.
- Value other than 1; disables the log.
If this key does not exist, it will be created automatically. To take effect, any change to
dfslog/RootShareAcquireSuccessEvent in the registry requires that you restart the DFSN service.
Support us
Winaero greatly relies on your support. You can help the site keep bringing you interesting and useful content and software by using these options:
If you like this article, please share it using the buttons below. It won't take a lot from you, but it will help us grow. Thanks for your support!
Advertisеment
