Secure Connection Failed
 The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.

I need to connect to a ProLiant iLO (management controller) using fedora 21 with FF v36.0 and get the message: Secure Connection Failed The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. FF no longer provides details about why it decided not to proceed, but I presume that the iLO certificate cannot be verified. Apparently there is no mechanism for allow me, the competent user, to add an exception. The mozilla developers, praised by their name, have decided to build a car that refuses to take the driver to some destinations. Here's a tip for others: add this repository for Opera and use Opera. It doesn't dictate to the user: --start of /etc/yum.repos.de/ruario_opera.repo-- [home_ruario_opera] name=Opera packages (Fedora_21) type=rpm-md baseurl=http://download.opensuse.org/repositories/home:/ruario:/opera/Fedora_21/ gpgcheck=1 gpgkey=http://download.opensuse.org/repositories/home:/ruario:/opera/Fedora_21/repodata/repomd.xml.key enabled=1 --end-- and leave the Mozilla developers to stew in their own juices. Treefrob