IIS Security Settings for Silverlight
The web is great for learning patterns and practices when you are planning to deploy a solution. With Silverlight learning how to configure IIS for best results in a very secured environment is a huge task, what happens if you just configure IIS to access Windows Authentication, would the request from Silverlight for the clientaccesspolicy.xml or the crossdomain.xml file are being requested with your Windows Authentication over a few firewalls?
Integrated Windows authentication does not work across proxy servers or other firewall applications.
If integrated Windows authentication fails, due to improper user credentials or some other problem, the browser will prompt the user to enter their user name and password.
So if is Silverlight requesting that file protected by Integrated Windows authentication in a background thread, the browser will not display the prompt, therefore, Silverlight won’t access that resource and your application will fail miserably.
