CrossDomainError on same domain

Question

I\'m learning to build Silverlight 3 apps using WCF to communicate with the back end. We are going to deploy to IIS7 on Server2008 or Vista. The client binaries as well as the

Answer 1

For two documents to be considered to have the same origin everything must be exactly the same: protocol (http/https), domain and port.

So, if you open up http://localhost and try to make a request to http://localhost:2721, you'll get that error.

Answer 2

You need to have a crossdomain.xml and/or a clientaccesspolicy.xml at the root of your website (crossdoomain.xml is required for for flash compatability, both work with silverlight). This xml needs to cotain the following:

<?xml version="1.0" encoding="utf-8" ?>
<access-policy>
  <cross-domain-access>
    <policy>
      <allow-from http-request-headers="*">
        <domain uri="*"/>
      </allow-from>
      <grant-to>
        <resource path="/" include-subpaths="true" />
      </grant-to>
    </policy>
  </cross-domain-access>
</access-policy>