Nodejs Cluster with socket.io loose connections

I am using node.js with cluster module in order to create multiprocess socket.io server.

Using this example I have created the following server-client application:

Server:

var cluster = require('cluster');

// Start master process
if (cluster.isMaster) {
    // Create slave workers (in this example there is only one)
    var worker = cluster.fork();

    // Starts a server that will delegate the connection to the worker
    var routerServer = net.createServer(function(connection) {
        worker.send({type: 'new_connection'}, connection);
    });

    routerServer.listen(443, "my-ip-address");
} else {
    // Start a server on random Port
    var slaveHttp = require("http").Server();
    slaveHttp.listen(0, "localhost");

    // Connect socket.io to the server
    var io = require('socket.io')(slaveHttp);
    io.on('connection', function (socket) {
        console.log("Connected");
    });

    // On server messsage (new connection) emit it to the server
    process.on('message', function(message, handle) {
        if (message.type == 'new_connection') {
            slaveHttp.emit('connection', handle);
        };
    });
}

Client:

var io = require('socket.io-client');

function connect(index) {
    connection = io.connect("http://my-ip-address", {
                                reconnection: true,
                                reconnectionDelay: 1000,
                                timeout: 3000,
                                multiplex: false });

    connection.on('connect', function (socket) {
        console.log(index + ': Connected');
    });

    connection.on('connect_error', function (e) {
        console.log(index + ': Connection Error: ' + e);
    });

    connection.on('message', function () {
        console.log(index + ': Server message');
    });

    connection.on('disconnect', function () {
        console.log(index + ': disconnect');
    });
}

for (var i = 0; i < 10; i++) {
    setTimeout(function(index) { 
        return function() { connect(index); }
    }(i), i * 5000);
};

The problem is that some of the clients in the above example managed to connect to the server and exchange messages, but the others failing on timeout, weirder then that I can see in the server's console that it received the connections for the timed-out clients but for some reason they don't succeed to communicate.

If I replace the server code to be on the same process this code runs perfectly.

Can anyone help me?