Windows Server: Out-of-band updates fixes Active Directory forest trust information bug (Feb. 4, 2022)

Windows[German]Microsoft has released Out-of-band updatesfor .NET Framework on February 4, 2022. This is to fix a bug when reading or writing Active Directory Forest Trust Information on Windows servers from Apps. The bug is caused by the January 11, 2022 security updates and results in a 0xc0000005 error.


In the Windows Server Health Status Dashboard, Microsoft posted in the Known Issues section an entry Apps that acquire or set Active Directory Forest Trust Information might have issues as of Feb. 4, 2022. The entry describes a bug in Windows Server operating systems. The text states:

After installing the updates that were released on or after January 11, 2022, applications that use Microsoft .NET Framework to acquire or set Active Directory forest trust information might fail, close, or you might receive an error from the application or from Windows. You may also see an access violation error (0xc0000005).

For developers, Microsoft still advises that affected applications use the System.DirectoryServices API. The following server operating systems are affected by this bug:

  • Windows Server 2022
  • Windows Server 2019
  • Windows Server 2016
  • Windows Server 2012 R2
  • Windows Server 2012

Microsoft has fixed this bug with an out-of-band update for the version of .NET Framework used by the application.  The following updates are available:

  • Windows Server 2022: .NET Framework 4.8 KB5011258
  • Windows Server 2019: .NET Framework 4.8 KB5011257, NET Framework 4.7.2 KB5011259
    Windows Server 2016: .NET Framework 4.8 KB5011264

For .NET Framework versions not listed above, Microsoft is still working on a patch that should be released in the coming days. 

These out-of-band updates are not available through Windows Update and are not installed automatically. To obtain the standalone package, search the Microsoft Update-Katalog for the KB number for the desired version of Windows and .NET Framework. Administrators can manually import these updates into Windows Server Update Services (WSUS) and Microsoft Endpoint Configuration Manager. Instructions for WSUS can be found at WSUS and the Catalog Site, while instructions for Configuration Manager can be found at the article Import updates from the Microsoft Update Catalog. (via)


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