What phone are you using and could you see if you could apply the following method:
Account Name : Stream ( or Any )
UDP port range - 1024 - 65535 (By default you get this range)
Use Pref. Access point - Yes (If you already Configure your mobile for GPRS)
Now click back, and select stream and activate it using Option.
Hope this helps. If not, please provide us with your device model and what you have tried.