Mineos dashboard wont open

i installed mineos like in the tutorial(for debian) but when i try to open the dashboard, it opens only the connection refused screen. how i can find out, what the problem is?

# supervisorctl status mineos
mineos                           RUNNING    pid 1846, uptime 0:00:05
$ curl https://localhost:8443/admin/login.html
<!DOCTYPE html>
<!--[if lt IE 7]>      <html class="no-js lt-ie9 lt-ie8 lt-ie7"> <![endif]-->
<!--[if IE 7]>         <html class="no-js lt-ie9 lt-ie8"> <![endif]-->
<!--[if IE 8]>         <html class="no-js lt-ie9"> <![endif]-->
<!--[if gt IE 8]><!--> <html class="no-js"> <!--<![endif]-->
<more, but omitted...>