Telnet is an application layer protocol, as specified in [RFC854], and is supplemented by various other RFCs (Requests for Comments). The Telnet Authentication Option (as specified in [RFC2941]), specifies the authentication option to the Telnet protocol as a generic method for negotiating an authentication type and mode, including whether encryption should be used and whether credentials should be forwarded. While the Telnet Authentication Option specifies command and message formats, it does not specify an authentication type. This document specifies how Telnet client software can use the Telnet: NT LAN Manager (NTLM) Authentication Protocol to authenticate itself to a Telnet server.
Sections 1.8, 2, and 3 of this specification are normative and can contain the terms MAY, SHOULD, MUST, MUST NOT, and SHOULD NOT as defined in RFC 2119. Sections 1.5 and 1.9 are also normative but cannot contain those terms. All other sections and examples in this specification are informative.