Hi Sorin,

As Daniel has mentioned, a little more information would be appreciated.

As such I would like to know:

* What protocol are you using? I am assuming HTTP rather than SMTP, POP3 and IMAP - although NTLM is support for these protocols as well.

* What server are you trying to authenticate against?

* Do you have a version of curl that works for you on another platform?

I run on Windows myself and have used NTLM (both the native and Windows SSPI implementations) to authenticate against IIS as well as a Microsoft Exchange Server but also use libcurl in our product at work to authenticate against Exchange from Red Hat, Centos and Windows (using the native NTLM message implementation).

Kind Regards

Steve

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** [bugs:#1364] NTLM fails in 7.36**
**Status:** open
**Labels:** ntlm 
**Created:** Wed Apr 23, 2014 11:32 AM UTC by Sorin Sbarnea
**Last Updated:** Thu Apr 24, 2014 08:51 AM UTC
**Owner:** Daniel Stenberg
it seems that curl NTLM authentication is broken for quite a long time. 
I tested with wget and authentication went ok without any problem.
Here are the results with curl (ALL FAILED):
* OS X 10.9 native curl fails
curl 7.30.0 (x86_64-apple-darwin13.0) libcurl/7.30.0 SecureTransport zlib/1.2.5
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtsp smtp smtps telnet tftp
Features: AsynchDNS GSS-Negotiate IPv6 Largefile NTLM NTLM_WB SSL libz 
* OS X 10.9 latest curl installed via brew
curl 7.36.0 (x86_64-apple-darwin13.1.0) libcurl/7.36.0 SecureTransport zlib/1.2.5
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtsp smtp smtps telnet tftp
Features: IPv6 Largefile NTLM NTLM_WB SSL libz 
* Ubuntu 12.04 LTS
curl 7.22.0 (x86_64-pc-linux-gnu) libcurl/7.22.0 OpenSSL/1.0.1 zlib/1.2.3.4 libidn/1.23 librtmp/2.3
Protocols: dict file ftp ftps gopher http https imap imaps ldap pop3 pop3s rtmp rtsp smtp smtps telnet tftp
Features: GSS-Negotiate IDN IPv6 Largefile NTLM NTLM_WB SSL libz TLS-SRP 
Also, I found people reporting similar bugs on major linux distributions, here are few links:
http://stackoverflow.com/questions/4341368/curl-always-returns-401-with-ntlm
https://bugs.launchpad.net/ubuntu/+source/curl/+bug/675974
https://bugzilla.redhat.com/show_bug.cgi?id=799557
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