Can't join on my server

there are multiple u need them all?

I have tested and i have found two errors they bothsay in grey on top connection lost and the first says internal server error in white below. The other one says: Internal Exception: java.io.IOException: An existing connection was broken software-controlled by the host computer

An other information i forgot at the first message is that whenever i try to join i first stay 1 sec on the server then i get kicked