May 19, 2019—KB4505056 (OS Build 17763.504)

Applies to: Windows 10, version 1809Windows Server 2019, all versions

Improvements and fixes


This update includes quality improvements. Key changes include:

  • Addresses an issue that may prevent access to some gov.uk websites that don’t support HTTP Strict Transport Security (HSTS) when using Internet Explorer 11 or Microsoft Edge.

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 KB4503327.

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.
When attempting to print from Microsoft Edge or other Universal Windows Platform (UWP) applications, you may receive the error, "Your printer has experienced an unexpected configuration problem. 0x80070007e."

This issue is resolved in KB4501371.

After installing KB4493509, devices with some Asian language packs installed may receive the error, "0x800f0982 - PSFX_E_MATCHING_COMPONENT_NOT_FOUND."
  1. Uninstall and reinstall any recently added language packs. For instructions, see Manage the input and display language settings in Windows 10.
  2. Select Check for Updates and install the April 2019 Cumulative Update. For instructions, see Update Windows 10.

Note If reinstalling the language pack does not mitigate the issue, reset your PC as follows:

  1. Go to the Settings app > Recovery.
  2. Select Get Started under the Reset this PC recovery option.
  3. Select Keep my Files.

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

How to get this update


Before installing this update

Prerequisite: The servicing stack update (SSU) (KB4499728) must be installed before installing the latest cumulative update (LCU). The LCU will not be reported as applicable until the SSU is installed. For more information, see Servicing stack updates.

If you are using Windows Update, the latest SSU (KB4499728) 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

  • UK customers : This update will be applied automatically to resolve this issue. You may be required to restart your device again. If you are affected by this issue, Check for updates to apply the update immediately.
  • Customers outside of the UK: This update will not be applied automatically. If you are affected by this issue, we recommend that you apply this update from Windows Update and then restart your device.

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 4505056