The problem is the certificate of that server, you can see this in your browser by following this link:
you will see a message about the certificate that it only matches: distributions.freedesktop.org, farsight.freedesktop.org, fontconfig.freedesktop.org, fontconfig.org, freedesktop.org, geoclue.freedesktop.org, secure.freedesktop.org,
www.fontconfig.org,
www.freedesktop.org
regards,
Tlowk