I upgraded to iOS 6 and now my wi if wont work on my 4s with AT&T. My other devices and upgraded fine an iPad and iPhone 4. Anyone else having problems?
Try going to Setting>> General>> Reset>> Reset Network Settings -- then you'll have set-up and reconnect to your previously set-up wifi network(s).
Why would connecting to WiFi even attempt to open a web page? Something is really messed up.
Aside from resetting network settings, one could try putting their phone into airplane mode for 30 seconds, then turn it back off and see what happens... also - power off the phone and reboot.