I've setup three mongo nodes in replica set (primary,secondary and arbiter)
I'm using driver 1.4.7
All is working expected with node driver, I can retrieve data, mongo does switching from secondary to primary when I shutdown primary. Problem is that I can't detect on error/close events, it doesn't trigger.
I tried with standalone mongo and it does triggers error/close when I kill mongo process, but when I use replicaset, it doesn't do anything.

here is the code for replicaset:
........
var MongoClient = require('mongodb').MongoClient,
MongoServer = require('mongodb').Server,
MongoRepSet = require('mongodb').ReplSetServers;

var server1 = new MongoServer(config.db.host, 9000);
var server2 = new MongoServer(config.db.host, 9001);
var server3 = new MongoServer(config.db.host, 9002);
var servers = [];
servers[0] = server1;
servers[1] = server2;
servers[2] = server3;

var Client = new MongoClient(new MongoRepSet(servers));

Client.open(function(err, Client) {
if (err)

{ var db_error = new DbConnectionError('Can not connect to the database'); throw db_error; }

else {
logger.status('Server connected to Db');
var db = Client.db('db_name');
db.on('close', function(result)

{ logger.status('Connection to Db lost'); }

);
db.on('reconnect', function()

{ logger.status('Server reconnected to Db'); }

);
db.on('error', function(err)

{ console.log(err); }

)
DB.client = db; // assign to module property, for reuse
..............