Windows Server: How to install .NET Framework 3.5 on Windows Server 2012

Windows 2012 warning message when installing .net 3.5:
“Do you want to specify an alternate source path? One or more installation selections are missing source files…”

There is a bug in Windows Server 2012 when trying to add the .NET Framework 3.5 from Server Manager.
In order to get it to work, I had to enable the feature via the Command Prompt.

This is the command that I had to type:

dism /online /enable-feature /featurename:NetFX3 /all /Source:d:sourcessxs /LimitAccess

Note: Source should be the Windows installation disc. In my case, this was located on D:

The installation process will display in the command prompt Window.

By: D. Classon