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You are a brave person. :)
Given that MS struggles to get official updates to work properly, I'd never install their preview ones.
January 19, 2018 - KB4057400 (Preview of Monthly Rollup)
Applies to: Windows 7 Service Pack 1Windows Server 2008 R2 Service Pack 1
Improvements and fixes
This non-security update includes improvements and fixes that were a part of KB4056894 (released January 4, 2018) and also includes these new quality improvements as a preview of the next Monthly Rollup update:
- Addresses issue where every smart card logon to a Windows Terminal Server/Remote Desktop Server may result in a handle leak in the certprop service. Token leaks result in session leaks on computers that have installed MS16-111/KB3175024 and superseding fixes.
- Adds support for the SHA2 server’s authentication endpoint support for the Windows Server Update Services server.
For more information about the resolved security vulnerabilities, see the Security Update Guide.
Known issues in this update
Symptom
Because of an issue that affects some versions of antivirus software, this fix applies only to computers on which the antivirus ISV updated the ALLOW REGKEY.
Workaround
Contact your antivirus manufacturer to verify that their software is compatible and that they have set the following REGKEY on the computer::
Key="HKEY_LOCAL_MACHINE"Subkey="SOFTWARE\Microsoft\Windows\CurrentVersion\QualityCompat"
Value Name="cadca5fe-87d3-4b96-b7fb-a231484277cc"
Type="REG_DWORD”
Data="0x00000000”
How to get this update
This is provided as an Optional update on Windows Update. For more information about how to run Windows Update, see How to get an update through Windows Update. 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 update 4057400.
Source: https://support.microsoft.com/en-us/help/4057400
Direct download links for KB4057400 MSU file from Microsoft Update Catalog:
Download KB4057400 MSU for Windows 7 32-bit (x86) - 136.0 MB
Download KB4057400 MSU for Windows 7 64-bit (x64) - 231.4 MB
You are a brave person. :)
Given that MS struggles to get official updates to work properly, I'd never install their preview ones.