Applies ToWindows 10, version 1803, all editions

Release Date:

21/05/2019

Version:

OS Build 17134.799

The Windows 10 April 2018 Update will reach end of service on November 12, 2019 for Home and Pro editions. We will begin updating devices running the Windows 10 April 2018 Update starting July 16, 2019 to help ensure that these devices remain in a serviced and secure state. For more information, see the Windows 10, version 1903 section of the release information dashboard.

Reminder: March 12th and April 9th will be the last two Delta updates for Windows 10, version 1803. Security and quality updates will continue to be available via the express and full cumulative update packages. For more information on this change please visit our blog.

Starting with update KB4499183, we are introducing functionality that allows you to decide when to install a feature update. You control when you get a feature update while simultaneously keeping your devices up to date. Feature updates that are available for eligible devices will appear in a separate module on the Windows Update page (Settings > Update & Security > Windows Update). If you would like to get an available update right away, select Download and install now. To find out more about this feature, please go to this blog. 

When Windows 10 devices are at, or within several months of reaching, end of service, Windows Update will begin to automatically initiate a feature update. This keeps those devices supported and receiving the monthly updates that are critical to device security and ecosystem health.

 

Improvements and fixes

This update includes quality improvements.  Key changes include:

  • Allows users to go back to a host browser from a Windows Defender Application Guard (WDAG) container.

  • Addresses an issue that causes Internet Explorer to stop responding to a browse request.

  • Addresses an issue with looping redirects between Microsoft Edge and Internet Explorer 11.

  • Updates wininet.dll to prevent the re-creation of File Transfer Protocol (FTP) control sessions.

  • Addresses an issue that prevents the OS from loading new icon files if it encounters an icon file that has a bad format.

  • Addresses an issue to set the date separator properly in the Japanese short date format. For more information, see KB4469068.

  • Updates time zone information for the Palestinian Authority.

  • Addresses an issue in which the desktop wallpaper image set by a Group Policy will not update if that wallpaper image has the same name as the previous image.

  • Addresses an issue that prevents the removal of Bluetooth® peripheral devices from some systems with specific Bluetooth radios.

  • Addresses an issue with using an apostrophe or single quote character in the log entries of the Event Log Service.

  • Addresses an issue in which Windows attempts to renew Azure Active Directory (AAD) token certificates when there is no internet connectivity. This issue occurs during AAD authentication and slows the performance of applications.

  • Addresses an issue that prevents updates from downloading from a Windows Server Update Services (WSUS) server when a Windows Defender Application Control policy is set to manage which updates can be deployed.

  • Addresses an issue that disconnects a remote desktop session when you lock the session using a third-party credential provider.

  • Addresses an issue that may cause a temporary KRB_AP_ERR_MODIFIED Kerberos sign-in failure in applications and services configured to use a Group Managed Service Account (GMSA). This issue occurs after the automatic update of the service account password.

  • Addresses an issue that prevents ActiveX controls from automatically installing through a proxy server.

  • Addresses an issue that causes a sign-in to fail with the error, “Incorrect Username or password” when using an empty or null password and Windows Defender Credential Guard is enabled.

  • Addresses an issue that causes Microsoft Office and other applications to prompt for a password after you change a user account password. This issue occurs on hybrid Azure Active Directory (AD) joined systems.

  • Addresses an issue with BranchCache when it is in distributed cache mode. BranchCache may use more disk space than assigned for the republication cache. To fully address the issue, devices that have exceeded the disk space assignments should empty BranchCache using the netsh branchcache flush command.

  • Addresses an issue that may cause a Stop D1 error when you increase the random-access memory (RAM) capacity of a CPU (“hot add”) on a virtual machine.

  • Addresses an issue that may cause event 7600 in the Domain Name System (DNS) server event log to contain an unreadable server name.

  • Addresses an issue that may cause an error when you attempt to access a Network File System (NFS) share.

  • Addresses an issue that may cause a server to need a restart because the system nonpaged pool consumes too much memory.

  • Addresses an issue that prevents NumLock from working properly in a Remote Assistance session when the Remote Assistance window gains and loses focus.

  • Addresses an issue with the "Allow uninstallation of language features when a language is uninstalled." Group Policy.

  • Addresses an issue in Windows Defender Application Guard (WDAG) that displays the error "0xc000026b" when a user signs out.

  • Addresses an issue that causes the Windows Event Log service to stop working when certain characters are included in an event.

  • Addresses an issue that causes rendering to stop working for <svg> elements.

  • Addresses an issue that causes a delay when loading many unsigned Domain Name System (DNS) zones related to the Domain Name System Security Extensions (DNSSEC) feature. This issue occurs after configuring the following registry setting:

    Path: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DNS\Parameters

    Setting: EnableFastLoadUnsignedZones

    Type: DWORD

    Value: A value of 1 enables the feature. A value of 0 disables the feature.

    Restart the operating system or the DNS server after changing the registry values.

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

Known issues in this update

Symptom

Workaround

After installing this update, there may be issues using the Preboot Execution Environment (PXE) to start a device from a Windows Deployment Services (WDS) server configured to use Variable Window Extension. This may cause the connection to the WDS server to terminate prematurely while downloading the image. This issue does not affect clients or devices that are not using Variable Window Extension.

This issue is resolved in KB4503286.

Certain operations, such as rename, that you perform on files or folders that are on a Cluster Shared Volume (CSV) may fail with the error, “STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5)”. This occurs when you perform the operation on a CSV owner node from a process that doesn’t have administrator privilege.

Do one of the following:

  • Perform the operation from a process that has administrator privilege.

  • Perform the operation from a node that doesn’t have CSV ownership.

Microsoft is working on a resolution and will provide an update in an upcoming release.

Internet Explorer 11 may fail to open if Default Search Provider is not set or is malformed.

This issue is resolved in KB4503286.

Devices may have issues connecting to some Storage Area Network (SAN) devices using Internet Small Computer System Interface (iSCSI) after installing this update. You may also receive an error in the System log section of Event Viewer with Event ID 43 from iScsiPrt and a description of “Target failed to respond in time for a login request.”

This issue is resolved in KB4509478.

How to get this update

Before installing this update

Microsoft strongly recommends you install the latest servicing stack update (SSU) for your operating system before installing the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing the LCU. For more information, see Servicing stack updates.

If you are using Windows Update, the latest SSU (KB4497398) will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog. 

Install this update

To download and install this update, go to Settings > Update & Security > Windows Update and select Check for updates.

To get the standalone package for this update, go to the Microsoft Update Catalog website.

File information

For a list of the files that are provided in this update, download the file information for cumulative update 4499183. 

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