I get the message "No mapping between account names and security IDs was done." when trying to join the domain from a Win XP Pro box. The particular computer and user are in the smbpasswd and /etc/passwd files. The registry patch (requiresignorseal) has been done on the XP Pro. Some specifics are as follows: Samba 2.2.8a running on Solaris 8 Win XP Pro w/ SP#1 # Global parameters [global] workgroup = GRAPHICS netbios name = SERVER encrypt passwords = Yes domain logons = Yes preferred master = Yes domain master = Yes [netlogon] comment = netlogon path = /usr/local/samba/netlogon write list = @sysadmin guest ok = Yes I have spent some time looking over documentation and archives with no success. Please keep any replies simple as I am just an architect posing as an IT person. Edward A. Ottesen, AIA StruXture Architects E-mail: eao@struxture.com