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NegotiateStream.BeginAuthenticateAsServer Method (ExtendedProtectionPolicy, AsyncCallback, Object)

Called by servers to begin an asynchronous operation to authenticate the client, and optionally the server, in a client-server connection. The authentication process uses the specified extended protection policy. This method does not block.

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

[HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading = true)]
public virtual IAsyncResult BeginAuthenticateAsServer(
	ExtendedProtectionPolicy policy,
	AsyncCallback asyncCallback,
	Object asyncState
)

Parameters

policy
Type: System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy

The ExtendedProtectionPolicy that is used for extended protection.

asyncCallback
Type: System.AsyncCallback

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

asyncState
Type: System.Object

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

Return Value

Type: System.IAsyncResult
An IAsyncResult object indicating the status of the asynchronous operation.

ExceptionCondition
ArgumentException

The CustomChannelBinding and CustomServiceNames on the extended protection policy passed in the policy parameter are both null.

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.

NotSupportedException

Windows 95 and Windows 98 are not supported.

ObjectDisposedException

This object has been closed.

NoteNote:

The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: ExternalThreading. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.

The authentication uses the server's DefaultCredentials. No Service Principal Name (SPN) is specified for the server. The impersonation level is Identification, the security level is EncryptAndSign.

If the policy parameter is null, then an extended protection policy is used that has PolicyEnforcement set to Never.

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.

To block until the operation completes, use one of the AuthenticateAsServer 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 7, Windows Server 2008 R2

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

.NET Framework

Supported in: 3.5 SP1

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