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NegotiateStream.AuthenticateAsServer Method (ExtendedProtectionPolicy)

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

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

public virtual void AuthenticateAsServer(
	ExtendedProtectionPolicy policy
)

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.

PlatformNotSupportedException

The policy parameter was set to Always on a platform that does not support extended protection.

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

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.

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later)

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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