Microsoft has released the February 2021 C patches for certain versions of Windows 10. These are the new optional updates for Windows 10, versions 1909 / 1903 and 1809. Microsoft has also announced that a preview update for Windows 10, version 20H2 and Windows 10, version 2004 will be available soon.

Since the update is marked as a preview, only users who click the Check for Manual Updates button will see these updates in preview. Otherwise they will not be installed automatically.

Monthly Update C for February 2021 is now available for Windows 10, version 1909, and Windows 10, version 1809. https://t.co/0TjO1ENcGP

– Windows Update (@WindowsUpdate) 17. February 2021

Here’s the change.

Windows 10 version 1909, KB4601380 (OS Build 18363.1411) Overview

Moreover, these values are no longer automatically updated.

  • Fixes a memory leak in Internet Explorer 11 that occurs when using the Chinese language pack.
  • Resolves the problem of cases where certain policies for COM+ calls cause certain applications to be blocked.
  • Removes the problem that makes fonts incorrect.
  • Fixed an issue that sometimes prevented strings from being entered into the Input Method Editor (IME).
  • Problem with APISetWindowRgnfixed . It incorrectly sets the window region coordinates to the client’s region, rather than the top left corner of the window. Therefore, the user cannot maximize, minimize or close the window.
  • Removes the shutdown error that occurs during startup.
  • Deletes the history of previously used photos from the user’s profile.
  • Resolves an issue that could slow down the installation of the Windows Hello for Business (WHfB) Certificate Trust when you open the Settings-> Accounts-> Login Options page.
  • Fixed an issue that caused the Windows Remote Management (WinRM) host process to stop when formatting messages from the PowerShell plug-in.
  • Fixed an issue in the Windows Management Instrumentation (WMI) service that caused a data leak when security settings were applied to WMI namespace permissions.
  • Fixes the problem of screen freezing after opening games with certain hardware configurations.
  • Increases the startup time of applications that have roaming settings when User Experience Virtualization (UE-V) is enabled.
  • Resolves an issue causing the Trusted Platform Module (TPM) to fail. That’s why TPM-based scenarios don’t work.
  • Indicates an issue where an administrator in a trusted MIT domain cannot get a Kerberos service ticket from Active Directory (AD) domain controllers. This occurs on devices that have Windows updates installed that contain CVE-2020-17049 security and have PerfromTicketSignature set to 1 or higher. These updates were published between 10. November 2020 and the 8th. December 2020 published. The ticket entry also terminates with a KRB_GENERIC_ERROR error if the caller provides a ticket without a PAC (TGT) as a proof-of-concept ticket without specifying the USER_NO_AUTH_DATA_REQUIRED flag.
  • Indicates high memory and CPU usage in Microsoft Defender for Endpoint.
  • Enhanced data loss prevention and internal risk management capabilities on Microsoft 365 endpoints.
  • Fixes the problem with x86 version of Microsoft Excel 365 version 2011. It will not open if you enable the SimExec Exploit Protection feature in Defender Exploit Protection, or it will stop working if you disable SimExec Exploit Protection and enable CallerCheck.
  • Resolves an issue where an error is displayed when you try to open an untrusted web page with Microsoft Edge or an untrusted Microsoft Office document. The error lies in the fact that the WDAG report is a container : Error: 0070003, ext error: 0x000001. This issue occurs after installing the KB4565627 .NET update.
  • Fixes the problem that prevents wevtutil from parsing the XML file.
  • Fixes the problem that the Elliptic Curve Digital Signature Algorithm (ECDSA) does not report an error when it generates invalid keys of 163 bytes instead of 165 bytes.
  • Adds support for using the new Chromium-based Microsoft Edge as an assigned kiosk access application. You can now also configure the pause key sequence for the individual application terminals. For more information, see Configuring Microsoft Edge Kiosk Mode.
  • Eliminates the problem of User Datagram Protocol (UDP) broadcast packets that are larger than the Maximum Transmission Unit (MTU). Devices that receive these packets reject them because the checksum is invalid.
  • Resolves a problem when the WinHTTP AutoProxy service does not match the value you set for Maximum Lifetime (TTL) in the proxy autoconfiguration file (PAC). This prevents the cache file from being dynamically updated.
  • Improves the ability of the WinHTTP Web Proxy Auto-Discovery Service to ignore invalid Web Proxy Auto-Discovery Protocol (WPAD) URLs returned by a Dynamic Host Configuration Protocol (DHCP) server.
  • Resolves an issue that may cause the IKEEXT service to stop sporadically.
  • Fixed an issue when upgrading to Windows Server 2019 using an .iso image. If you change the name of the default administrator account, the Local Security Authority (LSA) procedure may no longer work.
  • Resolves an issue that could cause a 7E shutdown error innfssvr.syson servers running the Network File System (NFS) service.
  • Resolves an issue where the User Profile Service cannot reliably detect slow or fast connections.
  • Removes the controversial problem of locking metadata when using workbooks.
  • Fixed an issue where workbook synchronization fails with error code 007017c when on-demand file access is enabled.
  • Updates the Open Mobile Alliance (OMA) device management (DM) synchronization log by adding a reason for logging client-server requests. The reason for registration allows the Mobile Device Management (MDM) department to make better decisions about synchronous sessions. With this change, the OMA-DM service protocol version 4.0 must negotiate with the Windows OMA-DM client.
  • Eliminates the problem of failover in environments with IPv6-only clusters. If the failover cluster is in operation for more than 24 days, failover attempts may fail or be delayed.
  • Adds a new dfslogkey as described below :
    • The path of keys: HKEY_LOCAL_MACHINE/SOFTWARE/MICROSOFT/dfslog.
    • The RootShareAcquireSuccessEvent field has the following possible values :
      • Default value = 1; activates the log.
      • Any value other than 1; disables the protocol.

If this key does not exist, it will be created automatically. Any change to
dfslog/RootShareAcquireSuccessEvent in the registry requires a restart of the DFSN service to take effect.

Windows 10 version 1809, KB4601383 (OS Build 17763.1790) Overview

Moreover, these values are no longer automatically updated.

  • Fixes a memory leak in Internet Explorer 11 that occurs when using the Chinese language pack.
  • Disables the default token binding in Windows Internet (WinINet).
  • Resolves an issue where the User Account Control (UAC) dialog box is unexpectedly displayed when speech recognition is enabled.
  • Resolves the problem of cases where certain policies for COM+ calls cause certain applications to be blocked.
  • Removes the problem that makes fonts incorrect.
  • Problem with APISetWindowRgnfixed . It incorrectly sets the window region coordinates to the client’s region, rather than the top left corner of the window. Therefore, the user cannot maximize, minimize or close the window.
  • Fixed an issue that sometimes prevented strings from being entered into the Input Method Editor (IME).
  • Deletes the history of previously used photos from the user’s profile.
  • Fixed an issue where the wrong language is displayed when logging into the console after changing the system language.
  • Fixed an issue that caused the Windows Remote Management (WinRM) host process to stop when formatting messages from the PowerShell plug-in.
  • Fixed an issue in the Windows Management Instrumentation (WMI) service that caused a data leak when security settings were applied to WMI namespace permissions.
  • Increases the startup time of applications that have roaming settings when User Experience Virtualization (UE-V) is enabled.
  • Resolves an issue causing the Trusted Platform Module (TPM) to fail. That’s why TPM-based scenarios don’t work.
  • Fixes the problem of unsigned program files not executing when the Windows Defender application control is in scan mode, but allows unsigned images.
  • Resolves an issue with the Key Distribution Center (KDC) code not checking the invalid domain status when the domain controller is rebooted. Error message: STATUS_INVALID_DOMAIN_STATE.
  • Indicates an issue where an administrator in a trusted MIT domain cannot get a Kerberos service ticket from Active Directory (AD) domain controllers. This occurs on devices that have Windows updates installed that contain CVE-2020-17049 security and have PerfromTicketSignature set to 1 or higher. These updates were published between 10. November 2020 and the 8th. December 2020 published. The ticket entry also terminates with a KRB_GENERIC_ERROR error if the caller provides a ticket without a PAC (TGT) as a proof-of-concept ticket without specifying the USER_NO_AUTH_DATA_REQUIRED flag.
  • Enhanced data loss prevention and internal risk management capabilities on Microsoft 365 endpoints.
  • Fixes the problem with x86 version of Microsoft Excel 365 version 2011. It will not open if you enable the SimExec Exploit Protection feature in Defender Exploit Protection, or it will stop working if you disable SimExec Exploit Protection and enable CallerCheck.
  • Resolves an issue where an error is displayed when you try to open an untrusted web page with Microsoft Edge or an untrusted Microsoft Office document. The error lies in the fact that the WDAG report is a container : Error: 0070003, ext error: 0x000001. This issue occurs after installing the KB4565627 .NET update.
  • Fixes the problem that prevents wevtutil from parsing the XML file.
  • Fixes the problem that the Elliptic Curve Digital Signature Algorithm (ECDSA) does not report an error when it generates invalid keys of 163 bytes instead of 165 bytes.
  • Eliminates the problem of User Datagram Protocol (UDP) broadcast packets that are larger than the Maximum Transmission Unit (MTU). Devices that receive these packets reject them because the checksum is invalid.
  • Resolves an issue that may cause the IKEEXT service to stop sporadically.
  • Fixed an issue when upgrading to Windows Server 2019 using an .iso image. If you have changed the name of the default administrator account, the Local Security Authority (LSA) procedure may no longer work.
  • Resolves an issue causing the cluster disk to shut down and the cluster log to report an RPC_X_BAD_STUB_DATA error.
  • Resolves an issue that could cause a 7E shutdown error innfssvr.syson servers running the Network File System (NFS) service.
  • Resolves an issue where the User Profile Service cannot reliably detect slow or fast connections.
  • Removes the controversial problem of locking metadata when using workbooks.
  • Fixed an issue where workbook synchronization fails with error code 007017c when on-demand file access is enabled.
  • Updates the Open Mobile Alliance (OMA) device management (DM) synchronization log by adding a reason for logging client-server requests. The reason for registration allows the Mobile Device Management (MDM) department to make better decisions about synchronous sessions. With this change, the OMA-DM service protocol version 4.0 must negotiate with the Windows OMA-DM client.
  • Eliminates the problem of failover in environments with IPv6-only clusters. If the failover cluster is in operation for more than 24 days, failover attempts may fail or be delayed.
  • Adds a new dfslogkey as described below :
    • The path of keys: HKEY_LOCAL_MACHINE/SOFTWARE/MICROSOFT/dfslog.
    • The RootShareAcquireSuccessEvent field has the following possible values :
      • Default value = 1; activates the log.
      • Any value other than 1; disables the protocol.

If this key does not exist, it will be created automatically. Any change to
dfslog/RootShareAcquireSuccessEvent in the registry requires a restart of the DFSN service to take effect.

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frequently asked questions

On what day of the week does Microsoft release updates?

The second Tuesday of each month is usually called Patch Tuesday. This is when Microsoft releases security updates for Windows (desktop and server versions), Office and related products. The fourth Tuesday of each month is reserved for insecure updates.

Will Microsoft release a new version of Windows?

Windows 10 fans have found out a little more about Microsoft’s plans for 2021. A brand new version of the operating system will be available on some devices next year. As mentioned in the last Windows article, a new version of Windows 10, called Windows 10X, is expected to be released in the first half of 2021.

What are Microsoft Preview updates?

It will be distributed for the next monthly update so customers can proactively download, test and provide feedback. The monthly rollup overview is specific to each product and covers new unsafe updates and includes corrections to the previous monthly rollup.

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