[nadams]

> Why? The entire point of ports is so you don't have to do this.

There are use cases - many nefarious cases but some real world cases.

Let's say your university allows everything through 80 but blocks everything else. You could SSH home or stream content.

Another use case could be that you have a web site and game server on same server. An interesting implementation could be to listen on port 80 so that they could connect to yourserver.com via HTTP and view information about the game/server and connect on the same port. Interesting but not very practical.

I suppose an acceptable/respectable use case would be custom load balancers or honey pots.