Hi Diarra,
The check in bbb-conf is to see if BigBlueButton is responding to an API request. It does something similar to
but you can still check to see if the SSL configuration works with nginx.
1. Try restarting nginx
sudo service nginx restart
Did you get an error?
2. Try accessing the home page from nginx
Did it load? If not, try checking the error logs for nginx
/var/log/nginx/error.log
If (1) and (2) are working, you should be able to use the landing page to try joining a session.
3. Try joining a session
If the above page does not load, check tomcat7 for errors on startup
/var/log/tomcat7/catalina.out
If you can join the session but the client does not load, check red5 for errors
usr/share/red5/log/error.log
Try the above and let us know how far you get.
Regards,... Fred