Installing .NET 3.5.1 on Windows 2012 – Error 0x800F081F

Recently, when trying to install Office 365 Dirsync, I ran into an issue with the installation of .NET 3.5.1 as a feature.  I received the error:

Error: 0x800F081F

The Source files could not be found

Since this was a newly installed server, it was baffling as to what the issue was.  After some troubleshooting, I determined there were two causes:

  1. The windows Component Store was damaged
  2. A hotfix KB2966827 had already been installed that causes this issue.

To resolve these issues, I did the following:

  1. I ran DISM /Online /Cleanup-Image /RestoreHealth to repair the Component Store. (http://blogs.technet.com/b/joscon/archive/2012/11/30/how-to-troubleshoot-error-0x800f081f-when-installing-roles-and-features.aspx)
  2. I determined if KB2966826, KB2966827, or KB2966828 were installed, and uninstalled them until after .NET 3.5.1 was installed. (http://www.askvg.com/fix-0x800f0906-and-0x800f081f-error-messages-while-installing-net-framework-3-5-in-windows-8/) After installing .Net 3.5.1, you can safely re-install the hotfixes.
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About Gary Cooper

I am a Senior Systems Architect for a small midwestern US consulting company (Horizons Consulting) and I currently am certified by Microsoft
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