Allow insecure transport in Silverlight 4.0

Hi,

I'm trying to use UserNamePasswordValidator for custom validation of user name and password in a wcf service call from Silverlight 4.0 by using custom binding, Http transport with TransportSecurityBindingElement.CreateUserNameOverTransportBindingElement  and Allow insecure transport set to ture.

Is this possible in SL 4.0?  I know this can be done between a windows console application and the service. But in SL i cant find the Allow insecure transport attribute on TransportSecurityBindingElement

Server Config

    <bindings>
      <customBinding>
        <binding name="InsecureCredentials">
          <security authenticationMode="UserNameOverTransport" allowInsecureTransport="true" />
          <textMessageEncoding messageVersion="Soap11" />
          <httpTransport />
        </binding>
      </customBinding>
    </bindings>


Client Custom Binding


public class CustomHttpMessageInspectorBinding : CustomBinding
    {
 
        public CustomHttpMessageInspectorBinding()
        {
 
        }
 
        public CustomHttpMessageInspectorBinding(IClientMessageInspector messageInspector)
        {
            ChannelBindingElement = newMessageInspectorBindingElement();
            ChannelBindingElement.MessageInspector = messageInspector;
        }
 
        publicMessageInspectorBindingElement ChannelBindingElement
        {
            get;
            set;
        }
 
        publicoverrideBindingElementCollection CreateBindingElements()
        {
            BindingElementCollection bindingElements = base.CreateBindingElements();
            bindingElements.Add(ChannelBindingElement);
            HttpTransportBindingElement transport = newMyPseudoHttpsTransportBindingElement();
 
            transport.MaxReceivedMessageSize = 2147483647;
            transport.MaxBufferSize = 2147483647;
 
            TransportSecurityBindingElement security = TransportSecurityBindingElement.CreateUserNameOverTransportBindingElement();
            security.IncludeTimestamp = true;
           
            TextMessageEncodingBindingElement element = newTextMessageEncodingBindingElement();
            bindingElements.Add(security);
            bindingElements.Add(element);
            bindingElements.Add(transport);
            return
 bindingElements;
        }
    }


Thanks

Gautham