UniDays access error, "You do not have a working internet connection. Check your settings and try again."

When attempting to validate my student status for UniDays, I am unable to access the login page.

The following error is shown, "You do not have a working internet connection. Check your settings and try again", even though I do have internet access (checked by using other applications working requiring internet connection).

How do I resolve this error or validate using another method on iPhone?