KB4343893 Update

This update includes quality improvements. No new operating system features are being introduced in this update. Key changes include:

• Addresses an issue in Microsoft Foundation Class (MFC) applications that may cause applications to flicker.
• Addresses an issue that causes win32kfull.sys to stop working (Stop 3B) when cancelling journal hook operations or disconnecting a remote session.
• Addresses an issue that caused users to press Ctrl+Alt+Delete twice to exit assigned access mode when autologon was enabled.
• Addresses an issue that prevented the Device Guard PackageInspector.exe application from including all the files needed for an application to run correctly once the Code Integrity policy was completed.
• Addresses an issue that prevents users of PIV/CAC smart cards from authenticating to use enterprise resources or prevents Windows Hello for Business from configuring on first logon.
• Addresses an issue that causes Microsoft Edge to stop working after setting a DLL rule in AppLocker.
• Addresses an issue that, in some cases, failed to clear decrypted data from memory after a CAPI decryption operation was completed.
• Addresses an issue that causes the Wi-Fi EAP-TTLS (CHAP) authentication to fail if a user saves credential information before authentication.
• Addresses an issue that causes high CPU usage on machines with built-in Sierra broadband modules when switching from WLAN to LAN. The WWanSvc service continually claims additional memory until the machine becomes unresponsive and a black screen appears.
• Addresses an issue that prevents a checkpoint created on a Windows Server 2016 cluster from being reapplied. This occurs when VMs are running on a cluster-shared volume (CSV), and the error is “Failed to read from stream. HRESULT = 0xC00CEE3A.”
• Addresses an issue that prevents Folder Redirection from updating the server UNC path when the path changes because of a change to an environment variable (%HOMESHARE% or %USERNAME%). To prevent this problem, set the Folder Redirection policy to not move the data when the path changes.
• Addresses an issue that requires a password to be input twice if you connect to a locked device using Remote Desktop Connect.
• Addresses an issue that causes devices that have 802.1x Extensible Authentication Protocol (EAP) enabled to randomly stop working with the stop code ”0xD1 DRIVER_IRQL_NOT_LESS_OR_EQUAL”. The issue occurs when the kernel memory pool becomes corrupted. Crashes will generally occur in nwifi.sys.
• Provides a stability resolution for native Peripheral Component Interconnect Express (PCIe) enumeration and the runtime D3 (RTD3) state.
• Addresses an issue that may remove a Dynamic Host Configuration Protocol (DHCP) option from a reservation after changing the DHCP scope settings.
• Addresses an issue that may prevent the Start menu from opening after refreshing your PC.
• Extends the Key Management Service (KMS) to support the upcoming Windows 10 client Enterprise LTSC and Windows Server editions. For more information, see KB4347075.

If you installed earlier updates, only the new fixes in this package will be downloaded and installed on your device.