node.js event not listening after connection

I have a code where, socket is connected to node server.

io.sockets.on("connection", function(socket){
// socket object is printed with full of data.
// console.log works
// emit here works
});

but this emit is not received by client.

please help.. as well as, when i emit something from client side it is not recieved.

On the console, I can see whatever i emit in the server. but not getting listened on client side.

Client side code

 var socket = io.connect("http:///iag-stg.codewalla.com:8181");
 socket.on('same-event-name-as-in-server', function(data) {
            console.log(data);
        });

Starting server as -

var express = require('express')
, app =  express()
, http = require('http')
, server = http.createServer(app)
, sio =  require('socket.io')
, io = sio.listen(server) 
, events = require('events')
, redis = require('redis')
, config = require('./Config');

server.listen(8181);

running the node using following command

node filename.js

When i connect to client, this is on console.

debug - served static content /socket.io.js
debug - client authorized
info  - handshake authorized D4sz1PZoBhWgq-hzp8se
debug - setting request GET /socket.io/1/websocket/D4sz1PZoBhWgq-hzp8se
debug - set heartbeat interval for client D4sz1PZoBhWgq-hzp8se
debug - client authorized for
debug - websocket writing 1::