Playit MC Beta 1.7.3 issue

So I decided I want to make a cracked Beta 1.7.3 server on minecraft for me and my friends to play on.

but whenever we try and join, we all get the error “Connection Lost Internal exception: Java.net.SocketException: Connection reset”

I swear I have tried everything. Changing DNS settings, flushing DNS, etc. But still the same error.

Anyone have any ideas?