You can try the following:
1) Please try to reconnect to the internet/intranet and disable the firewall to see if that solves the problem.
2) Try to use these commands to access the course content:
learning.simulink.launchOnramp('slbe'); // Simulink Fundamentals
learning.simulink.launchOnramp('simulink'); // Simulink Onramp
I hope this helps.
