I can't connect to Internet from my PC through the N900.

I have Windows 7 64-bit. I installed Nokia PC Suite. Windows now knows a "Nokia N900 USB Modem". The N900 itself is connected to Internet and is plugged through USB on "PC Suite Mode".

But the PC Suite can't establish a connection. And using the "magic string" found in this thread, it doesn't work either in Windows.

What am I doing wrong?