Source:  Remote Access Client Messages

Explanation:  When third-party security is enabled, this message is sent from the remote access server after the ENDSECURITY message to indicate the beginning of the protocol session for this connection.

Action:  Proceed with usage of the session. For example, for PPP clients, exit the terminal window and enable the dialer to proceed with the PPP negotiation. For NCS clients, wait for the service selector to present the list of available NCS host sessions.