It's not a bug and seriously I explained this like 5000000 times now and no one ever freakin' looks >.<
1. Change the IP's over and over until you get the right combination.. then it will let you connect.. (IPs here let you in then the same IPs here don't let you in)
2. Go to the server.dat and change the ServerName to CoEmu (Not the flashname) <-- Suggest this when you get sick of the first one.
I have a guide somewhere also.. If you #Search
Good Luck,