Authentication in localhost

[facue]

Hi, first sorry for my english. I had this code in VS with pusherrestdotnet
var provider = new PusherProvider("xxxxx", "xxxxxxxxxxxxxxxxxxxxxx", "xxxxxxxxxxxxxx", null);

        string auth = provider.Authenticate(Request["channel_name"], Request["socket_id"]);

        var request = new ObjectPusherRequest("xxxx-xxxxx-xxxxxx-xxxx-xxxxxxxxx", "AddxxEvent", new
        {
            xxxx= "xxxx"
        });
        provider.Trigger(request);

on my production server it works ok, but on my localhost webclient function UploadString return exception, 401
Any ideas? I have win 7 home premium
Thanks!!!!
Regards