1. Open package manager console in Visual Studio
  2. Type: [Net.ServicePointManager]::SecurityProtocol = [Net.ServicePointManager]::SecurityProtocol -bOR [Net.SecurityProtocolType]::Tls12
  3. press "Enter", succeed.
  4. retry NuGet Manager

This will change the connection security protocol to nuget as specified in this article: Deprecating TLS 1.0 and 1.1 on NuGet.org

 

Reference: StackOverFlow Article

 
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