Can't find a match online at all!

[Sp00kyFox]

hope this helps you:

Can't Invite (or join) friend to versus match or lobby

activate the windows firewall (it is neccessary) and make sure that you get a teredo address by checking if there is a “Teredo Tunneling” entry under network adapters in the device manager (you may have to turn on “show hidden devices”). you can also put in the following line into a command prompt to see if it works: Netsh Int Teredo Show Stat they should be two IP-addresses in the stats if it works.