gistfile1.js

// WORKS
// Receives messages from both 'All' & '7' channels

var connection = $.hubConnection();
var proxy = connection.createHubProxy('applicationHub');


var init = function () {
    proxy.invoke('joinGroup', 7);
    deferred.resolve(proxy);
}

proxy.on('newTask', function (arg) {
    console.log('new task ' + arg);
});


connection.start({ withCredentials: false }).done(init);


// DOESNT WORK (for 'All' channel)
// Receives only messages from '7' channel


var connection = $.hubConnection();
var proxy = connection.createHubProxy('applicationHub');

var init = function () {
    proxy.invoke('joinGroup', 7);
    
    proxy.on('newTask', function (arg) {
      console.log('new task ' + arg);
    });

    deferred.resolve(proxy);
}

connection.start({ withCredentials: false }).done(init);