Escrevendo um aplicativo de teste para minha biblioteca baseada em AppFabric, comecei a receber uma exceção estranh

The X.509 certificate CN=servicebus.appfabriclabs.com chain building failed. The certificate that was used has a trust chain that cannot be verified. Replace the certificate or change the certificateValidationMode. The revocation function was unable to check revocation because the revocation server was offline.

Eu tentei com a próxima configuração sem sucesso

<behaviors>
 <endpointBehaviors>
  <behavior name="SecureMessageUserName">
   <clientCredentials>
     <serviceCertificate>
        <authentication revocationMode="NoCheck"/>
     </serviceCertificate>
   </clientCredentials>
  </behavior>
 </endpointBehaviors>
</behaviors>

e também comServicePointManager.CheckCertificateRevocationList definido comofalse sem sucesso.