curl/docs/cmdline-opts/ntlm.md

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c: Copyright (C) Daniel Stenberg, daniel@haxx.se, et al. SPDX-License-Identifier: curl Long: ntlm Help: HTTP NTLM authentication Mutexed: basic negotiate digest anyauth Protocols: HTTP Requires: TLS Category: auth http Added: 7.10.6 Multi: mutex See-also:

• proxy-ntlm Example:
• --ntlm -u user:password $URL ---

--ntlm

Use NTLM authentication. The NTLM authentication method was designed by Microsoft and is used by IIS web servers. It is a proprietary protocol, reverse-engineered by clever people and implemented in curl based on their efforts. This kind of behavior should not be endorsed, you should encourage everyone who uses NTLM to switch to a public and documented authentication method instead, such as Digest.

If you want to enable NTLM for your proxy authentication, then use --proxy-ntlm.