Remote login hangs on El Capitan
The first thing I noticed in your debug output is that you are attempting a connection to a public IP rather than an internal IP address.

This raises the question of where that IP address hits before it gets to your Mac. Almost certainly you have a router that is getting in the way.

Try making the connection to the Mac's internal address from another machine sitting inside your net. This is much more likely to work. Go to the "Network" preference pane in System Preferences and this will tell you what the network address of your Mac actually is.