Maximum concurrent Socket.IO connections

Question

This question has been asked previously but not recently and not with a clear answer.

Using Socket.io, is there a maximum number of concurrent connections that one c

Answer 1

This guy appears to have succeeded in having over 1 million concurrent connections on a single Node.js server.

http://blog.caustik.com/2012/08/19/node-js-w1m-concurrent-connections/

It's not clear to me exactly how many ports he was using though.