Quote Originally Posted by Freddie View Post
The color codes aren't finished. The current scheme is temporary. Blue means two socket connections between the computers; purple means one socket connection (they are connected in one direction but not the other); black means no connection.
I think you are color blind (it's ok, no shame, my dad is too) as it's yellow (or maybe mustard rather as it's a dark yellow) and not purple :-)

This being said, more seriously/interestingly, why do you need 2 sockets - a socket is bi directional; so you should only need either of the machine to connect to the other; not both