You have to have a port set for it, and by default the port for wcs is 3, the important reason is because you have to allow that port in your router or firewall. 3 works ok.. but we have found many of the bots or robo client folks use dont work well in a room hosted on port 3 or any number under 1024.
Ports also cant be used generally by more then one program at a time. If for example the port in your config is port 6699 and your winmx by default is set to 6699 you will get errors and problems..
My best advise it to change your port number on the config to something like 6698. Then you will need to allow this port for tcp in your routers or firewalls.
See if this change makes a difference for you.. and let me know