# apt-get install -y hubzero-cms-1.3.1

# hzcms install example
# a2dissite default default-ssl
# a2ensite example example-ssl
# /etc/init.d/apache2 restart

The default installation of the CMS uses a self signed SSL certificate. Some browers will not accept this certificate and not allow access to the site.
 

https://support.mozilla.org/en-US/questions/1012036

You will need to install a proper SSL certificate.