KB4550947 updates Windows 10 1607 to Build 14393.3659

Windows 10 1607 receives a new non-security patch “KB4550947” on 21st April 2020. This cumulative update brings some quality improvements along with fixes to known errors such as – 0xC0000005, 0x19, 0xC2, 0x18, etc. Furthermore, this addresses issues like – logman.exe, LsaIso.exe, lsass.exe, and others. Applying this patch will enhance the OS build version to 14393.3659. 

This time, you can’t have this cumulative update through the Windows Server Update Services (WSUS). However, you can still download/install the standalone package for KB4550947 visiting the Update-Catalog. In case you don’t want to manually avail this Tuesday Patch, go to the below path and click Check for updates at the Windows Update section. 


KB4550947 – New Features and Fixes

Here are the key highlights that came with this non-security patch –

  • Improves the Dynamic Data Exchange (DDE) issue that earlier causes a memory leak while connecting more than one client to the same server. 
  • Users may now paste the mixed content of images and text from Microsoft Word into Internet Explorer. 
  • KB4550947 addresses the sign-in issue logman.exe and memory leak error – LsaIso.exe.
  • Resolves the klist.exe issue that causes lsass.exe to stop working and generates an access violation error (0xC0000005). 
  • Works upon the Windows Security bug in which certain policies generate a duplicate rule ID error causing the Merge-CIPolicy PowerShell command to fail. 
  • The Microsoft Internet Information Services (IIS) management tools like IIS Manager will work effectively from now onwards. Earlier, this causes an error while managing an ASP.NET application that has configured SameSite cookie settings in web.config.
  • Addresses an anomaly on Srv2.sys that leads to different errors like – 0x19, 0xC2, and 0x18.
  • After upgrading to this build version, users may now delete notification state registries for any apps.
  • Improves the prevailing deadlock in the Remote Desktop Gateway service.
  • KB4550947 now allows removing local users from local built-in groups such as – “Guest” from the “Guests” local group.
  • There won’t occur any error while signing in to Windows during recovery mode. Previously, this results in an error message – “No administrator accounts are available on this machine”.

Known Issues 

  • After installing this non-security patch KB4550947, you can’t continue to use 14 or fewer characters while setting a “Minimum Password Length” policy. In case you do so, there appears an error message that reads – “2245 (NERR_PasswordTooShort)”.

How to Get this Update

There are two different channels from where you can download/apply this cumulative update to your Windows 10 version 1607. These are –

  • Windows Update – You will auto-receive a notification regarding the KB4550947 cumulative update. However, you must download and install the latest SSU i.e. KB4550994 in advance so that the update process completes successfully.
  • Standalone Package – If you don’t want to wait, visit Microsoft Update Catalog, download and run the standalone package that came along with this release. Just make sure to check your system architecture before downloading the specific .msu file.

Note: This patch is not available at the Windows Server Update Services (WSUS).

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