Starcraft 2

How do I link two laptops using serial USB converters???

I am trying to play the game starcraft 2 have two laptops each with a usb to serial converter, a serial cable, a null modem, and two gender adapters (to make the null modem fit) with everything hooked up and each computer set to a different com port I can't get the thing to run!!!

:worthy: HELP!!!!