The underlying connection was closed: an unexpected error occured on send

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Visual-Studio

I want to add Entity Framework in My Project .When I open nuget package manager it's doesn't load any package and give this meassage "

The Underlying connection was closed: An unexpected error occured on send

"
please some one help me how to I resolve this

What I have tried:

I want to add  Entity Framework in My Project .When I open nuget package manager it's doesn't load any package and give this meassage "<pre>The Underlying connection was closed: An unexpected error occured on send

"
please some one help me how to I resolve this