Can someone spot the problem with this implementation? I can open it up in the browser and it works, but a call from client side (using both jquery and asp.net ajax fails)

Service Contract

[OperationContract(Name = "GetTestString")]
[WebInvoke(Method = "GET",
           ResponseFormat = WebMessageFormat.Json
   )]
string GetTestString();

In Web.config among other bindings, I have a webHttp binding

<endpoint address="ajax" binding="webHttpBinding" contract="TestService" behaviorConfiguration="AjaxBehavior" />

EndPoint Behavior

  <endpointBehaviors>
    <behavior name="AjaxBehavior">
      <enableWebScript/>
    </behavior>
  </endpointBehaviors>
</behaviors>

Svc file

<%@ ServiceHost Service="TestService" %>

Client

var serviceUrl = "http://127.0.0.1/Test.svc/ajax/";
var proxy = new ServiceProxy(serviceUrl);

I am then using the approach in http://www.west-wind.com/weblog/posts/324917.aspx to call the service