Visual Studio 2019 - Nuget packages not getting installed

Question

When i try to install any new package i am getting below erro.

 

Error occurred while restoring NuGet packages: Unable to load the service index for source https://api.nuget.org/v3/index.json.

[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 remote name could not be resolved: 'api.nuget.org'