Firstly if MSIE is fishing for a dial-up connection
- Open IE
- View > Options...
- Auto Dial
- Disable Auto Dial
Try the WiFi again.
if that doesn't work, in IE type:
http://205.245.49.102/
If the page loads up, you have a DNS problem. If it doesn't then it's most likley a default gateway problem
(Manual assignment will not provide a default gateway over a roaming network - you need a default gateway
)