Forgive me for being new - but you've got start somewhere. I've setup SAMBA on a Unix server that talks to AD. Almost everything works save for a user name map. From my configuration (names changed)below I can attach from windusr1 on PC1 to the Unix system and it sets up as unxusr1 no problems and clean. I can access all three shares. However, when I try to do the same thing from PC2 for appusrwin I am prompted for a name/password. No matter what I put in (windows ID/password or Unix ID/password, or combinations of these)I can't connect. The message in the log.smbd is "domain_client_validate: unable to validate password for user appusru in domain XXXGLOBAL to Domain controller USORSDC00. Error was NT_STATUS_NO_SUCH_USER." Note that in reality the Unix ID and Windows are very similar, with the difference being that the Windows ID is the same as the Unix ID but with 2 more characters. What am I doing incorrectly? :::::::::::::: smb.conf :::::::::::::: [global] security = domain workgroup = XXXGLOBAL netbios name = unix01 password server = adserver01, adserver02 domain master = no local master = no preferred master = no username map = /usr/local/samba/lib/smb.users [homes] writeable = yes # +sysadmin is a Unix group which unxusr1 is a member valid users = +sysadmin wide links = no [trax] path = /var/data_files writeable = yes valid users = unxusr1, appusru wide links = no [test] path = /var/tmp writeable = yes valid users = unxusr1, appusru wide links = no :::::::::::::: smb.users :::::::::::::: unxusr1 = XXXGLOBAL\windusr1 appusru = XXXGLOBAL\appusrwin