Okay so I've been playing MC ever since late alpha and have never ran into thise problem. So today I started up a new Minecraft server with two of my friends, however, one of my friends can connect but the other cannot. My ports are forwarded correctly and everything and so I made the friend that couldnt connect to my server create his own server to see if I was able to join but I still unable. The thing is though friend #2 was still able to conncet to both mine AND his server so I dont understand please help!
Don't know what the problem is but what might help is have you and your friend connect to each other through a local server hosting program like hamachi for example It may or may not work but try it hope it helps