RIA (Rich Internet Applications) client runtimes like Silverlight and Flash does not allow any code to access cross domain sites unless the target sites specifically grant access. This is done to avoid issues like Cross-Site Scripting (XSS) attacks.
If you are involved in developing apps on Silverlight runtime, it helps to understand the runtime behavior for cross domain access both during development and deployment.
You can read my latest article on this:
Network Access from Silverlight and Cross Domain Access Guidelines
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