Cannot connect to secure socket.io server : ERR_SSL_PROTOCOL_ERROR

Question

I'm trying to use socket.io with existing application. My application runs on https://somedomain.com. Its using this code to connect to socket io server:

 var socket = io('https://localhost:3456/');
  socket.on('connect', function () {
    socket.send('hi');

    socket.on('message', function (msg) {
      // my msg
    });
  });

My socket.io server has this code to listen to incoming connections:

var io = require('socket.io').listen(3456);

io.sockets.on('connection', function(socket) {
    console.log("dupa");
    socket.on('message', function() {});
    socket.on('disconnect', function() {});
});

dupa is never displayed on server side and in Chrome browser console I receive:

GET https://localhost:3456/socket.io/?EIO=3&transport=polling&t=1412901063154-0 net::ERR_SSL_PROTOCOL_ERROR 

How can I get this possibly working?

Answer 1

Change https to http

var socket = io.connect("http://localhost:4000");