Hi, I have a ubuntu linux with otrs authenticating on a AD Windows 2K3, and all is fine. Now, I would like to add security to my AD, and I just want to allow users to authenticate only on your computer (not with the partner´s computer). All is fine with windows but i´ve problems with Otrs. The logs says this when a user try to conect to otrs: "... authentification failed: '80090308: LdapErr: DSID-0c090334, comment: AcceptSecurityContext error, data 531, vece ..." I've researched about that and "AcceptSecurityContext error, data 531, vece" means "Workstation not permited" and i´m trying to solve this problem. i've done: 1. i´ve joined ubuntu to AD with winbind and samba. 2. I've added ubuntu (the computer who have otrs and apache) to the user's allowed computer list. but still not working !! any sugestions, please? anything! Thanks.