NegotiateStream.AuthenticateAsClient Method (NetworkCredential, String)

Called by clients to authenticate the client, and optionally the server, in a client-server connection. The authentication process uses the specified client credential.

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

'Declaration
Public Overridable Sub AuthenticateAsClient ( _
	credential As NetworkCredential, _
	targetName As String _
)

Parameters

credential
Type: System.Net.NetworkCredential
The NetworkCredential that is used to establish the identity of the client.
targetName
Type: System.String
The Service Principal Name (SPN) that uniquely identifies the server to authenticate.

ExceptionCondition
AuthenticationException

The authentication failed. You can use this object to retry the authentication.

InvalidCredentialException

The authentication failed. You can use this object to retry the authentication.

ObjectDisposedException

This object has been closed.

InvalidOperationException

Authentication has already occurred.

- or -

This stream was used previously to attempt authentication as the server. You cannot use the stream to retry authentication as the client.

ArgumentNullException

targetName is Nothing.

The impersonation level is Identification, the security level is EncryptAndSign, and mutual authentication is requested. The NegotiateStream class will construct the SPN used for mutual authentication.

When authentication succeeds, you must check the IsEncrypted and IsSigned properties to determine what security services are used by the NegotiateStream. Check the IsMutuallyAuthenticated property to determine whether mutual authentication occurred.

.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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