IPad2 won't connect to password-protected Wifi

A username and a password are required for signing in my university's wifi network.
I know both fields are ok because I can log in with my Macbook.
In the iPad2, however, I'm redirected to an apparently expired certificate. Upon accepting the certificate, I'm told the iPad is unable to connect.
What do I do?

I've been around here for some time and have never heard this, but will certainly google it.  I'm not saying it's not possible, but I just don't see how the screens brightness can in any way effect one's ability to connect to a wifi router.  Still, stanger things have happened........
ETA:  I did as you suggested and found articles from 2010 about Original iPad, but found no reference to iPad 2. 

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