Sometimes if you have iPad connectivity problems getting to WiFi-UNI you need to have the iPad Forget the network and then reconnect.
Usually you can click on the arrow to the right of the WiFi-UNI wireless settings and click Forget network. Sometimes you do not see this option to forget the network and then you may need to remove the certificate to get things going again.
Settings / General
Scroll down to bottom of the list to Profile
Then remove the certificate
With the certificate removed then reconnect to the WiF-UNI and enter your CatID credentials.
Additionally, sometimes you have to power cycle the iPad