The cracks for Scene or P2P released games are usually coded for playing the single player, offline mode of a game and not for playing a game's multiplayer, online mode. If you want to play using the latter mode, you would need to connect to a legitimate server for authentication before having access to play. Game cracks usually can't get pass the authentication checks on a legitimate server. The only alternative is to try to find a pirate or open server that hosts the game but those kinds of servers are hard to find and don't last long before being found out and shut down.