Before you condemn F25, try some other browser than Konqueror and
make
sure you update your system fully.
My system is always up to date. I tested with firefox and konqueror. I
normally use firefox.
The SSL negotiation may have to do
with an outdated SSL or TLS library (that site uses TLS 1.2 and if all
you have is TLS 1.1 or 1.0 you could have an issue).
How do I now if I have TLS 1.2?