I am currently building Angular 2 demos from behind a corporate proxy server with known issues for blocking both NPM and TypeScript \'typings\' installs. While I have been able
Download and install Nodejs https://nodejs.org/en/download/
Check your proxy setting. Based on your organization it will be change. If proxy not define you need to define your proxy setting in to LAN setting.
Run CMD as Administrator enter the command
npm config set https-proxy http://10.10.20.60:80
run angular cli command:
npm i –g angular-cli