Cant connect to the same world

My client keep spawning in a separate map,
i dont know whats wrong i used my IP and port, added ?listening to my map.

Mine is doing the same thing. Solved it by ensuring ?listen is on the map name. Also added :7778 to the IP address. This is the port that the server seems to be listening to. EX: 192.168.1.21:7778 -game