JSON WebMethod not working in Sitefinity

Hi there,

I've sitefinity hosted in asphostportal.com. then I am trying to call via ajax a WebMethod hosted in a traditional ASP.Net
WebForm code-behind page. Here is the code for the WebMethod:

[WebMethod]
public static object States()

    StateProvince[] states = new StateProvince[] ;
    ApplicationServiceClient proxy = null;

    try
   
        proxy = new ApplicationServiceClient();
        states = proxy.GetStateProvinces();
   
    finally
   
        CloseServiceProxy(proxy);
   
    return states;

The WebMethod works just fine in my stand-alone development environment or if deployed normally to IIS, but when I deploy the aspx page to Sitefinity, I get the following exception when it's called:
Server Error in '/' Application.
Unknown web method States.aspx.
Parameter name: methodName
I'm not sure if Sitefinity is hijacking the URL and post-pending the ".aspx" or what is going on here.
Here is the jquery call that is calling the web method:

$.ajax(
        type: "POST",
        contentType: "application/json; charset=utf-8",
        url: "Regions.aspx/States",
        data: "",
        success: function(data)
            // implementation omitted
        ,
        error: function(xhr, msg)
            alert(xhr.responseText);
       
    );

I can replicate the problem by posting the request manually using Fiddler.
Again, this works just fine everywhere except when deployed to Sitefinity. Anybody have any thoughts?