Windows 7/8.1 Preview Rollup Updates KB4343894, KB4343891 (August 30, 2018)

Windows Update[German]Microsoft has released the preview rollups KB4343894 for Windows 7 SP1 and KB4343891 for Windows 8.1 as of August 30, 2018. Here is an overview of these updates.


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The updates are listed on this website (Windows 7) and on this website (Windows 8.1).

KB4343894 for Windows 7/Windows Server 2008 R2

Update KB4343894 (Preview of Monthly Quality Rollup for Windows 7 for x64-based Systems) is available for Windows 7 Service Pack 1 and Windows Server 2008 R2 Service Pack 1. This is not a security update. The preview rollup contains the patches from the monthly rollups and also addresses the following item:

Addresses an issue in Internet Explorer 11 that may cause a blank page to appear for some redirects. Additionally, if you open a site that uses Active Directory Federation Services (AD FS) or Single sign-on (SSO), the site may be unresponsive.

I’ve addressed the Single sign-on (SSO) issue within my blog post Updates KB4343205 and KB4343900 blocks Single sign-on. Whoever is affected by this problem can test whether the preview rollup fixes the bug. The update is offered via Windows Update, but can be downloaded manually via Microsoft Update Catalog.

In the known issues section, Microsoft states that the network controller may fail at certain third-party drivers after installation. The remedy is to reinstall the network driver. But I’m not sure if this bug has already been fixed – the note was also posted on August 14, 2018 and then removed after a few hours.

KB4343891 for Windows 8.1/Windows Server 2012 R2

Update KB4343891 is available for Windows 8.1 and Windows Server 2012 R2 as Preview of Monthly Rollup. This is not a security update. The preview rollup addresses the following problems: 

  • Addresses encoding issues with the Bitcoin symbol. 
  • Addresses an issue that causes TPM certificate enrollment to fail with application event log entries for the Microsoft-Windows-CertificateServicesClient-CertEnroll source. The two events reported are Event ID 85 and Event ID 13. 
  • Addresses an issue that causes svchost.exe to stop working intermittently. This issue occurs when the SessionEnv service is running, which causes a partial load of the user’s configuration during a Remote Desktop session.
  • Extends the Key Management Service (KMS) to support the upcoming Windows 10 client Enterprise LTSC and Windows Server editions. For more information, see KB4347075
  • Addresses an issue in Internet Explorer 11 that may cause a blank page to appear for some redirects. Additionally, if you open a site that uses Active Directory Federation Services (AD FS) or Single sign-on (SSO), the site may be unresponsive.

There is also a mention of the Single sign-on (SSO) issue I’ve addressed within my blog post Updates KB4343205 and KB4343900 blocks Single sign-on. There are no known issues. The update is offered via Windows Update, but can be downloaded manually via Microsoft Update Catalog.


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