I am having a similar problem to rushkk, but the afforementioned solutions have not worked. I can connect to my institute's wifi, and the institute's interrupt-login still comes up (Basically when you connect to wifi, then navigate to any page, a login page appears instead. Once you login, you can go about your business), but no other connectivity can be achieved. Pages don't load, email can't sync, not even ad-bars in apps load. This is odd because the eDGe has worked just fine for the past month here at work.

My concern is I was trying unsuccessfully to fiddle with my hosts file. You can access and open it with ASTRO, but you cannot replace it, nor save changes to it, do to it being read-only. Nevertheless, this problem did not happen until I tried to mess with it. Are there any tests one can do to determine if it's the hosts file?