You will need to allow cross site origins in your webconfig file. This is simply done using the following tags in your webconfig. You can replace the "*" with the domain you are making the request from (the origin).
also make sure
crossDomain: true,
on your ajax request.
<system.webServer>
<httpProtocol>
<customHeaders>
<add name="Access-Control-Allow-Origin" value="*" />
</customHeaders>
</httpProtocol>
</system.webServer>