NegotiateStream.AuthenticateAsServer Method (NetworkCredential, ExtendedProtectionPolicy, 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, authentication options, and extended protection policy.
Assembly: System (in System.dll)
abstract AuthenticateAsServer : credential:NetworkCredential * policy:ExtendedProtectionPolicy * requiredProtectionLevel:ProtectionLevel * requiredImpersonationLevel:TokenImpersonationLevel -> unit override AuthenticateAsServer : credential:NetworkCredential * policy:ExtendedProtectionPolicy * requiredProtectionLevel:ProtectionLevel * requiredImpersonationLevel:TokenImpersonationLevel -> unit
- Type: System.Net.NetworkCredential
The NetworkCredential that is used to establish the identity of the client.
- Type: System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy
The ExtendedProtectionPolicy that is used for extended protection.
- Type: System.Net.Security.ProtectionLevel
One of the ProtectionLevel values, indicating the security services for the stream.
credential is a null reference (Nothing in Visual Basic).
The authentication failed. You can use this object to try to r-authenticate.
The authentication failed. You can use this object to retry the authentication.
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.
Windows 95 and Windows 98 are not supported.
This object has been closed.
The policy parameter was set to Always on a platform that does not support extended protection.
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.
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.