Can't play online with 3 players - Please read!

[Adhenovan]

keep in mind to play on coldbird server or use external ip address (public ip address) there is only 1 device can connect. 1 ip address is only allowed to use for one device. if you and your bro use one same connection or ip address to play on coldbird it's won't work (its apply to with use of public ip address as server too) thats maybe the problem of your error. tunngle, hamachi, or evolve will solve your ip address problem. if you use same connection with your bro to play with your friend try using tunngle and use your ip as host then connect your bro to your ip, and ask your friend to join. the three of you must be on same network ex: (tunngle,or hamachi). i did this online method last year and its work, and remember use different mac address and disable fast memory like tywald said!