I recently got banned on the normal Steam MW3 (or I think I did).

Everytime I try connecting to online servers, it says "The Call of Duty Modern Warfare 3 server is not available at this time. Please try again later or visit Call of Duty Website (I can't post link on forum)

So I created another Steam account on the same computer (same I.P address) and am about to purchase MW3 again.

Does anyone know what ban this is and any way to by-pass it?

If not, will I be able to play online on the other account if I purchase the game a second time?