Not sure if this is relevant or of any use to you or not, but I was just searching issues with connecting to MC Servers.
Check out this link: https://bukkit.org/threads/cant-conn...server.168364/
If I am understanding it correctly, the IP that you gave me for the server is what would be used for other users wanting to connect to the server using the same network as you, but it isn't set up for users outside of that network? At least thats how I am understanding what I read.