I had a similar problem with my phone. I wasn't able to get any webpages to appear. Turns out I had to go into System Settings, Wireless & Networks, Wifi Settings, Advance. Then I went into Proxy and it had info in there, I cleared it and webpages started working.
Getting into the Proxy section may be different for your tablet but check it if you can find it.
Just a thought!
Like it is...Yusef Lateef