Multiple servers

[fozy]

Hello all I have one server up and running. I wanted to add another server to act as a sandbox and do testing on. I have it set up on another server with a different ip address. I see it on the server list and am able to log into it. However, I have another person that sees it on the server list but when he tries to connect the screen goes black like its trying to connect then it disconnects and sends him back to the login screen. I thought I changed all the necessary ports but still no luck. Any help or guidance would be greatly appreciated thanks in advance for any help.