Thanks Alan, The double '==' in the ntlm_auth command was the culprit. Things are working today. p.s. I had already stripped the usernames and verified the password so that was fine. Iain Grant Linux System Administrator Scottish Crop Research Institute Date: Wed, 17 Mar 2010 17:23:37 +0000 From: Alan Buxey <A.L.M.Buxey@lboro.ac.uk> Subject: Re: Talking to Windows 2003 AD To: FreeRadius users mailing list <freeradius-users@lists.freeradius.org> Message-ID: <20100317172337.GA16756@lboro.ac.uk> Content-Type: text/plain; charset=us-ascii Hi, > Now when I go to the next step and enable this in /etc/raddb/modules/mschap > > ntlm_auth = "/usr/bin/ntlm_auth --request-nt-key --username==%{%{Stripped-User-Name}:-%{User-Name:-None}} --domain=%{%{mschap:NT-Domain}:-OURDOMAIN} --challenge=%{mschap:Challenge:-00} --nt-response=%{mschap:NT-Response:-00}" radiusd -X and show us at least that bit where that command is called. you have 2 == is your command. is that intentional? you are allowing usernames that havent been sanitised or are blank (none) - is that intentional? alan ______________________________________________________ SCRI, Invergowrie, Dundee, DD2 5DA. The Scottish Crop Research Institute is a charitable company limited by guarantee. Registered in Scotland No: SC 29367. Recognised by the Inland Revenue as a Scottish Charity No: SC 006662. DISCLAIMER: This email is from the Scottish Crop Research Institute, but the views expressed by the sender are not necessarily the views of SCRI and its subsidiaries. This email and any files transmitted with it are confidential to the intended recipient at the e-mail address to which it has been addressed. It may not be disclosed or used by any other than that addressee. If you are not the intended recipient you are requested to preserve this confidentiality and you must not use, disclose, copy, print or rely on this e-mail in any way. Please notify postmaster@scri.ac.uk quoting the name of the sender and delete the email from your system. Although SCRI has taken reasonable precautions to ensure no viruses are present in this email, neither the Institute nor the sender accepts any responsibility for any viruses, and it is your responsibility to scan the email and the attachments (if any). ______________________________________________________