Event Hub SAS 401:Invalid authorization token audience

Hi,

I found an example online of using SAS to send to an Event Hub via JavaScript on a device.

I got this script to successfully post events, and then it stopped working.

Chrome Developer Tools Network says 401 (40104 Invalid authorization token audience.)

The Console message is:

 XMLHttpRequest cannot load https://devhub01-ns.servicebus.windows.net/devhub02/publishers/pd1/messages. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:16532' is therefore not allowed access. The response had HTTP status code 401.

What is strange is that it worked, and then stopped. Using this tool, I generated a new SAS token (a few times) , and the issue persists, despite the fact the a new SAS token seemed to be what got it working in the first place.

Here is the JavaScript (with the serviceNamespace and HubName changed to disable the SAS):

<input type="text" value="9" id="temp" /><input type="button" value="Send Temperature" onclick="sendTemperature()" /><label id="status"></label><script type="text/javascript">
function sendTemperature() {
    var sas = 'SharedAccessSignature sr=https%3a%2f%2fdevhub01-ns.servicebus.windows.net.servicebus.windows.net%2fdevhub02%2fpublishers%2fpd1%2fmessages&sig=gycTCE6nuqkbdG4GbDhfDkJ%2bLlZD%2b2s5X%2b12BSYCLcw%3d&se=1420704992&skn=Admin';

    var serviceNamespace = "DevHub01-ns";
    var hubName = "devhub02";
    var deviceName = "pd1";

    var xmlHttpRequest = new XMLHttpRequest();
    xmlHttpRequest.open("POST", "https://" + serviceNamespace + ".servicebus.windows.net/" + hubName + "/publishers/" + deviceName + "/messages", true);
	xmlHttpRequest.setRequestHeader('Content-Type',"application/json");
    xmlHttpRequest.setRequestHeader("Authorization", sas);


    xmlHttpRequest.onreadystatechange = function () {
        if (this.readyState == 4) {

            if (this.status == 201) {
                document.getElementById('status').innerText =
                    'Sent: ' + document.getElementById('temp').value;
            } else {
                document.getElementById('status').innerText =
                    this.status;
            }
        }
    };
    xmlHttpRequest.send('{"temperature":"20","area":"Frankfurt"}');
}</script>

Please let me know if you see a reason why this currently doesn't work.

Thanks,

Aron