Multiplayer problems + Tomato/MLPPP firmware confirmed
Major solution to connectivity problems found: MLPPP. If you use a Linksys router or any other with Tomato/MLPPP firmware to get around P2P throttling from your ISP you will not be able to connect to multiplayer games if MLPPP is turned on. You need to set it to off and reconnect your router. This is an odd problem since ive played dozens of multiplayer games over MLPPP just fine so not sure why it would be a problem but it somehow is for this particular game.