title: Trying to install using mix, (Mix) Could not access url error
body: <p>I am trying to install elixir packages and whenever I use mix command, I get this kind of message,</p>
  
  <pre><code>mix archive.install https://github.com/phoenixframework/phoenix/releases/download/v1.0.0/phoenix_new-1.0.0.ez
  Are you sure you want to install archive https://github.com/phoenixframework/phoenix/releases/download/v1.0.0/phoenix_new-1.0.0.ez? [Yn] y
  ** (Mix) Could not access url https://github.com/phoenixframework/phoenix/releases/download/v1.0.0/phoenix_new-1.0.0.ez, error: {:failed_connect, [{:to_address, {'github.com', 443}}, {:inet, [:inet], :nxdomain}]}
  </code></pre>
  
  <p>How do I avoid this?</p>