Visual Studio 2017 unable to connect to Nuget - nuget

i have a problem,
when i tried to Manage Nuget Packages VS2017 showed me this message:
[nuget.org] Unable to load the service index for source https://api.nuget.org/v3/index.json.
An error occurred while sending the request.
The underlying connection was closed: An unexpected error occurred on a send.
Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond
Please can you help me to solve this problem??
I'm going crazy
Thank you

That is a bug in VS 2017. (I had the same problem). This has been fixed in VS version 15.1 . To fix this problem update your VS through vs_Community.exe installer (which you can download here).

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