3.3.4.1 The NL_AUTH_MESSAGE Token

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The NL_AUTH_MESSAGE token contains information that is part of the first message in an authenticated transaction between a client and a server. It contains a message type, flags, and naming information. For the exact format, see section 2.2.1.3.1.

The NL_AUTH_MESSAGE token is part of the RPC PDU AUTH trailer structure as specified in [MS-RPCE] section 2.2.2.11.

The client generates an initial token and sends it to the server. The server receives the token, processes it, and passes back a return token to the client.

The exchange of this message requires a session key to have been negotiated as specified in section 3.1. Upon successful exchange of tokens, the application starts using per-message calls to protect the data being passed over the network.