Can't connect to one specific Minecraft server?

So, at my house, where I live I can connect to my friend's minecraft server, fine with no conflict. However, at my Dad's house, I can't connect at all. This is only me who can't. All my other friends can fine. Why is it just me who can't connect?

The server has to be "port forwarded" so people can connect to the server while not connected to the same wi-fi has the servers host and you need to be using the hosts public ip which you can find online while connected to the hosts internet at ipchicken.com if it is port forwarded then it should work