Gets or sets whether pre-authentication is enabled.
Assembly: System.Web.Services (in System.Web.Services.dll)
When a client requests a resource without using credentials, the server challenges the request and indicates what authentication schemes it supports. The client chooses an authentication scheme and sends the appropriate WWW-authenticate header to the server. When is true, the WWW-authenticate header is sent with all subsequent requests.
When is false, a request is made to the XML Web service method without initially attempting to authenticate the user. If the XML Web service allows anonymous access, then the XML Web service method is executed. If anonymous access is disallowed, a 401 HTTP return code is sent back to the client. In response, the WebClientProtocol class returns authentication credentials to the Web server. If the client is authenticated and subsequently authorized to access the XML Web service, the XML Web service method is executed; otherwise the client is denied access.
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.