Problem with some Mobile Broadband devices eg. Huawei E392 used as Telia for 4g usb modem.
it connect just fine, but you can´t access the iprange through the vpn tunnel, and it look like that no traffic has been transferred through the vpn
Install this fix, and reboot the pc:
win 7 x86:
dneupdate
Win 7 x64:
dneupdate64