public class MyPolicy: ICertificatePolicy
   {
      enum CertificateProblem : long
      {
         CertEXPIRED                   = 2148204801,
         CertVALIDITYPERIODNESTING     = 2148204802,
         CertROLE                      = 2148204803,
         CertPATHLENCONST              = 2148204804,
         CertCRITICAL                  = 2148204805,
         CertPURPOSE                   = 2148204806,
         CertISSUERCHAINING            = 2148204807,
         CertMALFORMED                 = 2148204808,
         CertUNTRUSTEDROOT             = 2148204809,
         CertCHAINING                  = 2148204810,
         CertREVOKED                   = 2148204812,
         CertUNTRUSTEDTESTROOT         = 2148204813,
         CertREVOCATION_FAILURE        = 2148204814,
         CertCN_NO_MATCH               = 2148204815,
         CertWRONG_USAGE               = 2148204816,
         CertUNTRUSTEDCA               = 2148204818
      }
      
      /// 

      /// Implement CheckValidationResult to ignore problems that 
      /// we are willing to accept. In this case, all those concerning Certificates.
      /// 
      public bool CheckValidationResult(ServicePoint sp, X509Certificate cert,
         WebRequest request, int problem)
      {       
         foreach (CertificateProblem problemCode in Enum.GetValues(typeof(CertificateProblem)))
         {
            int Certificate = unchecked( (int) problemCode);
            if ( problem == Certificate ) // only accept server name failed match
               return true;
         }
         // The 1.1 framework calls this method with a problem of 0, even if nothing is wrong
         return (problem == 0);         
      } 
   }