SslStream.AuthenticateAsServer Method (X509Certificate, Boolean, SslProtocols, Boolean)

Note: This method is new in the .NET Framework version 2.0.

Called by servers to begin an asynchronous operation to authenticate the server and optionally the client using the specified certificates, requirements and security protocol.

Namespace: System.Net.Security
Assembly: System (in system.dll)

virtual void AuthenticateAsServer (
	X509Certificate^ serverCertificate, 
	bool clientCertificateRequired, 
	SslProtocols enabledSslProtocols, 
	bool checkCertificateRevocation
public void AuthenticateAsServer (
	X509Certificate serverCertificate, 
	boolean clientCertificateRequired, 
	SslProtocols enabledSslProtocols, 
	boolean checkCertificateRevocation
public function AuthenticateAsServer (
	serverCertificate : X509Certificate, 
	clientCertificateRequired : boolean, 
	enabledSslProtocols : SslProtocols, 
	checkCertificateRevocation : boolean



The X509Certificate used to authenticate the server.


A Boolean value that specifies whether the client must supply a certificate for authentication.


The SslProtocols value that represents the protocol used for authentication.


A Boolean value that specifies whether the certificate revocation list is checked during authentication.

Exception typeCondition


serverCertificate is a null reference (Nothing in Visual Basic).


enabledSslProtocols is not a valid SslProtocols value.


The authentication failed and left this object in an unusable state.


Authentication has already occurred.


Client authentication using this SslStream was tried previously.


Authentication is already in progress.


This object has been closed.


The AuthenticateAsServer method is not supported on Windows 95, Windows 98, or Windows Millennium.

This method blocks until the operation completes. To prevent blocking until the operation completes, use one of the BeginAuthenticateAsServer method overloads.

If the authentication fails, you receive a AuthenticationException, and this SslStream is no longer useable. You should close this object and remove all references to it so that it can be collected by the garbage collector.

Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition Platform Note: The AuthenticateAsServer method is not supported.

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0