SslStream.EndAuthenticateAsClient Method

Ends a pending asynchronous server authentication operation started with a previous call to BeginAuthenticateAsServer.

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

public virtual void EndAuthenticateAsClient(
	IAsyncResult asyncResult


Type: System.IAsyncResult
An IAsyncResult instance returned by a call to BeginAuthenticateAsServer.


asyncResult is null.


asyncResult was not created by a call to BeginAuthenticateAsServer.


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


There is no pending server authentication to complete.

If the operation has not completed, this method blocks until it does. When the authentication succeeds, you must check the IsEncrypted and IsSigned properties to determine what security services are used by the SslStream. Check the IsMutuallyAuthenticated property to determine whether mutual authentication occurred.

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.

To perform this operation synchronously, use one of the AuthenticateAsServer methods.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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