The requested domain name is not configured for any web site:
https://connect.mandela.ac.za:443/Blogs/Developing,-Problematizing-and-Testing-An-Applied/August-2014/An-example-of-group-exercises-in-the-first-week-of
If you're an administrator of this site, you need to go to
Site Manager -> Sites
and use the following domain name either in the Site properties or add a new domain alias:
connect.mandela.ac.za:443