Creating SSL based WCF services requires a SSL certificate. Adam Nofsinger’s blog gives a really easy way to do this using SelfSSL from the IIS Toolkit…
Adam_Nofsinger.Tech: Self-signed SSL Certificate on Development PC
…Unfortunately self signed SSL certs will not work from SilverLight … (e.g. HTTPS WCF service called from SL) … :-(…
Mark Cooper 
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