Autocomplete 403s when behind a proxy
You should set your Base URL to

$base_url="http://site-name.dd:9999";


From default.settings.php


  If Drupal is generating incorrect URLs on your site, which could
   be in HTML headers (links to CSS and JS files) or visible links on pages
   (such as in menus), uncomment the Base URL statement below (remove the
   leading hash sign) and fill in the absolute URL to your Drupal installation.