X509ClientCertificateAuthentication Class

Specifies authentication properties for validating the client certificate.

Namespace: System.ServiceModel.Security
Assembly: System.ServiceModel (in system.servicemodel.dll)

public class X509ClientCertificateAuthentication
public class X509ClientCertificateAuthentication
public class X509ClientCertificateAuthentication
Not applicable.

If the CertificateValidationMode is set to Custom, then you must create a custom certificate validator that inherits from the X509CertificateValidator class. For more information, see How To: Create a Service Employing a Custom Certificate Validator.

The following code illustrates setting this property.

// Create a service host.
Uri httpUri = new Uri("http://localhost/Calculator");
ServiceHost sh = new ServiceHost(typeof(Calculator), httpUri);

// Get a reference to the authentication object.
X509ClientCertificateAuthentication myAuthProperties =

// Configure peer trust.
myAuthProperties.CertificateValidationMode =
// Configure chain trust.
myAuthProperties.CertificateValidationMode =
// Configure custom certificate validation.
myAuthProperties.CertificateValidationMode =

// Specify a custom certificate validator (not shown here) that inherits 
// from the X509CertificateValidator class. 
// creds.ClientCertificate.Authentication.CustomCertificateValidator =
//    new MyCertificateValidator();

The property can also be set in a configuration file.

     <authentication certificateValidationMode='ChainTrust' />


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0

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