Download Manager + USB Broadband Card

Do you use this to connect to the internet?

We have some interesting issues with the Download Manager with the Pantech USB Verizon UML290 Modem card. 

"When using the Akamai Download Manager and trying to register 3DS Max the process always failed because of "No Internet Connection". This was despite the fact that I had a perfectly functional internet connection. The only time it would work is if I was physically connected to a hardwired network or WiFi connection."