The requested domain name is not configured for any web site:
https://connect.mandela.ac.za:443/Groups/Special_One_Group/Library-Library_group_045cb38a-079f-45a6-b0b3-9e25c6d0c690.aspx
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