Hi Anil,Thank you Anil. That was the problem. Before I changed the user permission of /var/run/samba/winbindd_privileged/ with out any success. Below command done the trick. chgrp freerad /var/lib/samba/winbindd_privileged My FreeRADIUS is running in Ubuntu 14.04.1 LTS _______ Regards, Shyju Date: Sun, 16 Nov 2014 08:37:42 +0000 From: anilth@hi.is To: freeradius-users@lists.freeradius.org Subject: Re: Freeradius Active Directory Authentication using ntlm_auth What Linux distro are you running ? On 16/11/14 07:27, Shyju Kanaprath wrote: MS-CHAP-Error = "\000E=691 R=1" This stills seem to me permission issue. show your config modules/mscap ? If centos do this : chgrp radiusd /var/lib/samba/winbindd_privileged this should work - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html