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Microsoft has released the optional cumulative (preview) update KB5012636 for Windows 10 V1909 (LTSC) and Server 2019 on April 21, 2022 (C-Week). This is intended to fix various bugs in Windows 10 and in the corresponding Windows Server versions. Below I provide an overview regarding this update for Windows 10 and the Windows Server versions in question.
The update information can be found in the Windows 10 update history page. It should be noted that these updates are so-called preview or preview updates. These are optional and must be manually triggered for download and installation by default.
Update KB5012636 for Windows 10/Server 2019
The cumulative preview update KB5012636 is available for Windows 10 Enterprise 2019 LTSC, Windows 10 IoT Enterprise 2019 LTSC, Windows 10 IoT Core 2019 LTSC and Windows Server 2019. It upgrades the build to 17763.2867 and includes some fixes to address more serious bugs (e.g. server hangs, Point of Sales Terminals, PoS, take up to 40 minutes to start) in these Windows versions. Here is the list of fixes.
- New! Adds improvements for servicing the Secure Boot component of Windows.
- Addresses an issue in which certain Point of Sale terminals experience occasional OS startup delays during restart of up to 40 minutes.
- Addresses an issue that causes a remote desktop session to close or a reconnection to stop responding while waiting on the accessibility shortcut handler (sethc.exe).
- Addresses an issue that incorrectly returns Execution Policy settings from the registry.
- Addresses an issue that causes the Key Distribution Center (KDC) code to incorrectly return the error message "KDC_ERR_TGT_REVOKED" during domain controller shutdown.
- Addresses an issue that might cause Windows to stop working when you apply a Windows Defender Application Control (WDAC) policy that doesn't require a restart.
- Addresses an issue that might fail to copy the security portion of a Group Policy to a machine.
- Addresses an issue that causes the primary domain controller (PDC) of the root domain to generate warning and error events in the System log. This issue occurs when the PDC incorrectly tries to scan outgoing-only trusts.
- Addresses an issue that might prevent graphics processing unit (GPU) load balancing over Remote Desktop from working as intended.
- Addresses an issue that might occur when you use Netdom.exe or the Active Directory Domains and Trusts snap-in to list or modify name suffixes routing. These procedures might fail. The error message is, "Insufficient system resources exist to complete the requested service." This issue occurs after installing the January 2022 security update on the primary domain controller emulator (PDCe).
- Addresses an issue that affects a Server Message Block (SMB) multichannel connection and might generate a 13A or C2 error.
- Addresses an issue that causes a deadlock in the WebDav redirector. This issue occurs when you attempt to read a file from the local TfsStore, which causes the system to stop responding.
- Addresses an issue that causes virtual computer object (VCO) password settings failure on a distributed network name resource.
- Addresses an issue that might cause the server to lock up because the nonpaged pool grows and uses up all memory. After a restart, the same issue occurs again when you try to repair the damage.
The update is optional and is only offered when the user explicitly selects optional updates for installation in the settings page. The update can also be downloaded and installed from the Microsoft Update Catalog. The latest Servicing Stack Update (SSU) is integrated. Microsoft lists several known issues with this update in support article KB5012636. Further details can be found in the support article in case of doubt.
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