HttpListenerRequest.ClientCertificateError Property
.NET Framework 3.0
Gets an error code that identifies a problem with the X509Certificate provided by the client.
Namespace: System.Net
Assembly: System (in system.dll)
Assembly: System (in system.dll)
This property contains a Windows error code returned by the Secure Channel (Schannel) Security Support Provider Interface (SSPI), which is used to validate the certificate. For more information about SSPI support for Schannel, see “Creating a Secure Connection Using Schannel” in the Security documentation at http://msdn.microsoft.com/library.
The following code example checks this property to determine whether the request includes a valid client certificate.
Console.WriteLine("Listening for {0} prefixes...", listener.Prefixes.Count); HttpListenerContext context = listener.GetContext(); HttpListenerRequest request = context.Request; Console.WriteLine("Received a request."); // This server requires a valid client certificate // for requests that are not sent from the local computer. // Did the client omit the certificate or send an invalid certificate? if (request.IsAuthenticated && request.GetClientCertificate() == null || request.ClientCertificateError != 0) { // Send a 403 response. HttpListenerResponse badCertificateResponse = context.Response ; SendBadCertificateResponse(badCertificateResponse); Console.WriteLine("Client has invalid certificate."); continue; }