Sonar Tracker: The requested URL could not be retrieved

Overview

This article explains what to do if you receive the following The requested URL could not be retrieved message:

The message displays when your school's firewall isn't allowing access to the page you are trying to view.

Instructions 

Contact a member of your school's IT Support team and explain the problem to them.

Outcome

They will update the school's firewall, enabling you to view the content.

Updated