Why do I get "HTTP Status 500 - Internal Server Error" when I take an exam on the CISCO site?

Question

Cisco

In general, I have access as such to the exam about chapter N. When I go to the exam page, I get this:

Classmates are fine...
OS X is the latest version.
Safari latest version.
Error 500 seems to indicate a problem on the server side.
What is the problem and how to solve it? Has anyone experienced something similar?

Answer 1

It's clear.
It's all about Safari.
Everything is fine in Chrome.
So much for the network wizards ...
Some kind of shame on the part of Cisco.