I'm having this problem too. Started on my home network. The key is correct. I know because entering an IP address manually works fine. When "Automatic IP settings" is on in the WiFi config app, I can't get an IP. At home, where I administer the network, I just reserved an IP in the router, configured it manually on the phone, & all's well.
However, at work, where I *don't* administer the network, this just started happening. I guess I could poach IP's, but the network's likely to stomp on me at some point.
Other devices seem to be able to get DHCP assigned IP's just fine on either network. More than likely, it's the Pre's fault.
Does anyone have a clue what's causing this?
