Symptom: With a fresh MediaWiki-Vagrant with the https role, the resources (JS+CSS) are not loaded over HTTPS because the $wgServer variable is set to WebRequest::detectServer() in /vagrant/settings.d/wiki/CommonSettings.php (see bug 66399).
Explaination: The HTTPS is performed using nginx as a reverse proxy, and the function WebRequest::detectServer() assume in this case the HTTPS port is standard (443) instead of 4430 in MediaWiki-Vagrant ($wgServer = 'https://127.0.0.1').
Version: unspecified
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=70964