For disconnected sockets, specifies that authentication is required in order for a connect or accept operation to complete successfully. Setting this option actively initiates authentication during connection establishment, if the two Bluetooth devices were not previously authenticated. The user interface for passkey exchange, if necessary, is provided by the operating system outside the application context. For outgoing connections that require authentication, the connect operation fails with WSAEACCES if authentication is not successful. In response, the application may prompt the user to authenticate the two Bluetooth devices before connection. For incoming connections, the connection is rejected if authentication cannot be established and returns a WSAEHOSTDOWN error.