Cannot retrieve tweets based on hashtag with nodejs

I use the following code to retrieve in real time the tweets with a particuliar hashtag:

var util = require('util'),
  twitter = require('twitter');
var twit = new twitter({
  consumer_key: CONSUMER_KEY,
  consumer_secret: CONSUMER_SECRET,
  access_token_key: ACCESS_TOKEN_KEY,
  access_token_secret: ACCESS_TOKEN_SECRET
});

twit.stream('statuses/filter', {'track': ['#MYHASHTAG']}, function(stream) {
  stream.on('data', function(data) {
    console.log(util.inspect(data));
  });
  stream.on('error', function(err){
    console.log(err.message);
  });
});

I created a couple of tweets with this particular tag but they are not taken into account. The only output I have before the script exit is:

{ disconnect: 
  { code: 7,
   stream_name: 'User-statuses77671',
   reason: 'admin logout' } }

Any idea why they do not appear in the stream ?

Also, I would expect the above code to run continuously but it stop right away.

Note: I tried the same stuff with ruby (and tweetstream) and I have the same results.