Me and my friend have been trying to make a server. We had a private one going for us and a couple other people using Hamachi. After the server crashed one time, we have never been able to connect again. We were recently doing some testing and it appears that port 25565 is now closed. It was open before. What could of caused it to get closed and how does he re open it? I know a lot about computers but I don't know that much about networking so I really can't help him there.
Also, I know there's a way that you don't have to use Hamachi... how!? I have not been able to figure this out after hours of research, nothing works for us and we are forced to use Hamachi but now it seems that Hamachi has failed us also.