dotnet publish “Unable to load the service index for source https://api.nuget.org/v3/index.json”

I am getting error :

Unable to load the service index for sourcehttps://api.nuget.org/v3/index.json

with dotnet publish

I am trying to deploy docker base asp.net core solution from visual studio 2017with Amazon Tool Kit to AWS ECS.

I found several links but those do not work for me.

I tried by restarting docker service and Visual Studio also.