Silverlight accessing RIA Service

I have a Silverlight project, which call RIA service. I am getting the following error:

The extended protection settings configured on IIS do not match the settings configured on the transport. The ExtendedProtectionPolicy.PolicyEnforcement values do not match. IIS has a value of WhenSupported while the WCF Transport h开发者_如何学Pythonas a value of Never. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

My IIS Authentication -> Extended Protection is set to Accept. I do not want to set it to Off. If I do set it "Off" it works, but I do not want to do it for security reason.

How can I match the WCF Transport property with IIS without changing IIS setting. I would like to do it from WCF side. Any configuration I need to change?

My DomainService is like this: public class MyService : LinqToEntitiesDomainService