Socket.IO console.log not firing correctly

With the following code snippet, the console.log both explicitly defined and within the callback only fire when connections are made from 127.0.0.1.

    service.sockets.on('connection',function(socket){
        console.log("Incoming Socket Connection -> ",socket.id);
        if(typeof fn === 'function'){fn(socket);}
    });

Any other machines will not fire, but they receive connections and are served pages. Does NodeJS only show console output with connections from 127.0.0.1? I am very confused by this, and its making testing very difficult.