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3.1.5.2 Connectionless

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The client action for connectionless NTLM authentication is similar to that of connection-oriented authentication (section 3.1.5.1). However, the first message sent in connectionless authentication is the CHALLENGE_MESSAGE (section 2.2.1.2) from the server to the client; there is no client-initiated NEGOTIATE_MESSAGE (section 2.2.1.1) as in the connection-oriented authentication.

The message processing for connectionless NTLM authentication<52> is as specified in the following sections.