Get https://mcr.microsoft.com/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)

Ref: https://github.com/dotnet/dotnet-docker/tree/master/samples/aspnetapp
        https://stackoverflow.com/questions/46822391/docker-toolbox-tutorial-client-timeout-exceeded-while-awaiting-headers/48064026#48064026

docker for linux @ Windows 10 Prof 1803
1. Fail to build image as asp.net core app.
2. Error message:
Get https://mcr.microsoft.com/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
3. Change DNS Server from automatic to Fixed and Reset



4. Build aspnetapp images.
5. Test run
docker run --name aspnetcore_sample --rm -it -p 8000:80 aspnetapp