Scaling up Socket.IO server

We have a Node.JS script running for Socket.IO. We are having issue with concurrent connection limit. We want expert to consult with and scaling up performance of our [login to view URL] service. I want to be more specific regarding the requirements - 1. running multiple script to achieve more connections. 2. use redis 3. load balancing with Nginx This is based on our team's research but we are happy take better suggestions from developers.