Recently have installed Flutter and exploring hello-world app. Followed all steps mentioned at https://flutter.io/get-started/ and was able to run
:: flutt
I had the same issue. I am working in a company and I had to use https_proxy env variable to get connection.
Open cmd on Windows
set https_proxy=USERNAME:PASSWORD@hostname:port flutter create flutter run flutter packages get
set https_proxy=USERNAME:PASSWORD@hostname:port
flutter create
flutter run
flutter packages get
This worked for me, hope it helps!