The warning message "This connection is untrusted" is showed if you want to connect to the personal portal or the webmail with Firefox:

CA Problem

Because the identity used in our personal portal and webmail service can’t be verified by Firefox with its list of root certificate. You can fix this problem by following steps:

  • Launch Firefox, and type in the location bar. Then press “Enter”.
  • In “Downloading Certificate” dialog window, check “Trust this CA to identify websites” and press “OK”. This problem will be fixed.

Fix CA problem