laravel homestead cannot create project

I have download homestead box manually, and add it to vagrant like: "vagrant box add laravel/homestead virtualbox.box".
Then I run command "vagrant init laravel/homestead" to create a new development environment. Now I can start the virtual machine by "vagrant up". I login into the new virtual machine by "vagrant ssh". I run command "composer create-project laravel/laravel new-site" to create new project, but it always give error that authentication required (packagelist.org)

via Chebli Mohamed