On August 23, Windows update KB3176934 released for Windows Client. Due to a missing .MOF file in the build package, the update breaks DSC. All DSC operations will result in an “Invalid Property” error.

In addition, due to a missing binary in the build package, the update breaks PowerShell Implicit Remoting. Implicit remoting is a PowerShell feature where PowerShell commands work on a remote session instead of locally. Specifically, importing a remote session no longer works:

Import-PSSession : Could not load type ‘System.Management.Automation.SecuritySupport’ from assembly
System.Management.Automation, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35’.

To prevent these issues take the following actions:

  1. If you are using DSC from or on any Windows client, take the following steps:
    Uninstall the update if already installed. From elevated PowerShell prompt type
  2. If using WSUS, do not approve the update. Otherwise, Use Group Policy to set the ‘Configure Automatic Updates’ to ‘2 – Notify for download and notify for install’ as described in this Microsoft Support article.

According to Microsoft, a fix for this issue will be included in the next Windows update which is due out 8/30/2016.

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