As I said in your comment, essentially Express is receiving connections before the session store is fully connected. The solution is to wait for the connection to occur before allowing your application to start listening.

You can avoid this problem by using a callback on MongoStore creation, or passing in an already active connection.

Example using connect-mongo's Callback

var sessionStore = new MongoStore({ url: 'someConnectionUrl', db: 'audio-drop' }, function(e) {  var cookieParser = express.cookieParser('waytoblue');  app.use(cookieParser);  app.use(express.session({    store: sessionStore  }));  app.listen();});

Simple Mongoose Example

var mongoose = require('mongoose');mongoose.connect('localhost', function(e) {  // If error connecting  if(e) throw e;  var sessionStore = new MongoStore({ mongoose_connection: mongoose.connection }),      cookieParser = express.cookieParser('waytoblue');  app.use(cookieParser);  app.use(express.session({    store: sessionStore  }));  app.listen();});

Upgrade to connect-mongo version 0.8.0 which worked for me.

angular fullstack example

It´s just to encapsulate all the other stuff inside the mongoose.connect callback function

See my server/app.js

/** * Main application file */'use strict';// Set default node environment to developmentprocess.env.NODE_ENV = process.env.NODE_ENV || 'development';var express = require('express');var mongoose = require('mongoose');var config = require('./config/environment');// Connect to databasemongoose.connect(config.mongo.uri, config.mongo.options , function(e){// Populate DB with sample data  if(config.seedDB) { require('./config/seed'); }// Setup server  var app = express();  var server = require('http').createServer(app);  var socketio = require('socket.io')(server, {    serveClient: (config.env === 'production') ? false : true,    path: '/socket.io-client'  });  require('./config/socketio')(socketio);  require('./config/express')(app);  require('./routes')(app);// Start server  server.listen(config.port, config.ip, function () {    console.log('Express server listening on %d, in %s mode', config.port, app.get('env'));  });// Expose app  exports = module.exports = app;});

Hope it helps!!