I am getting This error:
[nuget.org] Unable to load the service index for source https://api.nuget.org/v3/index.json. An error occurred while send
I have faced the same problem with VS 2015 Go to the following folder
C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE
and add In my case is already present added the highlighted text
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Solved my issue