The blank page, instead of a login prompt, is linked to this error: `Content Security Policy: The page’s settings blocked the loading of a resource at self (“script-src https: 'unsafe-eval'”)`
Maybe it's something about [this line](d4bd77ca45/shellinabox/shell_in_a_box.jspp (L200))
The only way I found to fix that is to allow to use eval.
Add disable-ssl to prevent a failure of shellinabox because of the reverse proxy without ssl.
(Not tested on jessie)
Still there's a problem, no login prompt are printed.
The sysvinit script need to be tweaked to remove this fucking `-q` to see anything in syslog...