Won't connect to University wireless (https)

I couldn't connect to my Uni wireless last week, but just figured it was a problem at their end.
But when I got home, I noticed I couldn't get on to any secure (https) sites. Anyway, after playing around with the Keychain Access I managed to get past this. Everything was ok again.
But I'm back in uni, and I still can't get on to the wireless!
When I start off, the browser forces me to their homepage so I can login. Which is a secure site.
I've been on the network before, but the problem only seems to have happened just after I upgraded to 10.7.2
I've tried going in to keychain access again, but it seems either their network or the webpage buggers it up somehow. I can't even open it.
I've restarted the machine, and been able to open keychain access. But as soon as I connect to the network, keychain just crashes and can't be opened again!
The university IT support are useless. So was hoping someone on here could help out??
REALLY need to get an essay done!
Thanks,
Dan

No one got any idea?
It definately has something to do with Keychain. As I fixed it the other day, got on at uni. But it's doing it again now, and for the life of me I can't recreate what I did!
It seems to keep creating an unknown certifcate in Keychain, which just crashes it. I've tried deleting it, but it still crashes.
Once I get home I also have the problem of not being able to access HTTPS sites, until I restart and delete the certificate. Then it's fine at home, but still no luck a Uni, where I am first directed a verification page.
I also remember reading somewhere, something about the new ubd service causing an issue?
Any ideas?

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