I've probably read over 20 articles on rerouting the port when you're unable to ssh into another mac from terminal and get an error message saying the port is blocked. However, no matter how much I read I don't quite understand this. Why am I denied and does this have anything to do with firewalls? What exactly are ports and their relation to an ip address. I've read so much today on ip addresses that I'm sick of reading about ip addresses. Can someone explain this in dummy fashion cause I don't want to reroute anything or change any ip addresses if I don't have too. Changing an ip address can really screw up the connection.