SslStream.BeginAuthenticateAsServer Method (X509Certificate, AsyncCallback, Object)

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

Called by servers to begin an asynchronous operation to authenticate the client and optionally the server in a client-server connection.

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

Public Overridable Function BeginAuthenticateAsServer ( _
	serverCertificate As X509Certificate, _
	asyncCallback As AsyncCallback, _
	asyncState As Object _
) As IAsyncResult
Dim instance As SslStream
Dim serverCertificate As X509Certificate
Dim asyncCallback As AsyncCallback
Dim asyncState As Object
Dim returnValue As IAsyncResult

returnValue = instance.BeginAuthenticateAsServer(serverCertificate, asyncCallback, asyncState)
public IAsyncResult BeginAuthenticateAsServer (
	X509Certificate serverCertificate, 
	AsyncCallback asyncCallback, 
	Object asyncState
public function BeginAuthenticateAsServer (
	serverCertificate : X509Certificate, 
	asyncCallback : AsyncCallback, 
	asyncState : Object
) : IAsyncResult



The X509Certificate used to authenticate the server.


An AsyncCallback delegate that references the method to invoke when the authentication is complete.


A user-defined object that contains information about the operation. This object is passed to the asyncCallback delegate when the operation completes.

Return Value

An IAsyncResult object indicating the status of the asynchronous operation.

Exception typeCondition


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


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

This method authenticates using Default. The certificate revocation list is not checked during authentication. The client is not required to provide a certificate for authentication.

The asynchronous authentication operation must be completed by calling the EndAuthenticateAsClient method. Typically, the method is invoked by the asyncCallback delegate.

This method does not block while the operation completes. To block until the operation completes, use one of the AuthenticateAsClient method overloads.

For detailed information about using the asynchronous programming model, see Calling Synchronous Methods Asynchronously

If you receive a AuthenticationException, 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 BeginAuthenticateAsServer 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

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