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NegotiateStream.AuthenticateAsServer Method (NetworkCredential, ProtectionLevel, TokenImpersonationLevel)

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

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

public virtual void AuthenticateAsServer(
	NetworkCredential credential,
	ProtectionLevel requiredProtectionLevel,
	TokenImpersonationLevel requiredImpersonationLevel
)

Parameters

credential
Type: System.Net.NetworkCredential

The NetworkCredential that is used to establish the identity of the server.

requiredProtectionLevel
Type: System.Net.Security.ProtectionLevel

One of the ProtectionLevel values, indicating the security services for the stream.

requiredImpersonationLevel
Type: System.Security.Principal.TokenImpersonationLevel

One of the TokenImpersonationLevel values, indicating how the server can use the client's credentials to access resources.

ExceptionCondition
ArgumentNullException

credential is null.

ArgumentOutOfRangeException

requiredImpersonationLevel must be Identification, Impersonation, or Delegation,

AuthenticationException

The authentication failed. You can use this object to try to r-authenticate.

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 client. You cannot use the stream to retry authentication as the server.

NotSupportedException

Windows 95 and Windows 98 are not supported.

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.

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 an AuthenticationException or an InvalidCredentialException. In this case, you can retry the authentication with a different credential.

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

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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