Bump! I updated the socket plugin with the latest socket.io release.
I haven't actually tested it, but I'm 90% sure it'll work (I don't have Construct 2 on this computer, and because of a problem with my internet I am currently unable to download it). So if someone could give it a try (the cross browser version), that would be good.
example_server.js inside the zip file contains a socket.io server. You will need to install node.js (and NPM - comes by default with node.js on the windows installer). Make a new .bat file, and put in:
npm install socket.io
And then it will be running, and the cap should connect to it. I will write the tutorial for it as soon as I can, I promise!