Hi all, This is my first message here, so pardon me if I break some etiquette. I have a Linux (Debian 4, kernel 2.6.18-4-686) SaMBa (3.0.24) server whose shares I want to mount on a Distributed File System running from a Windows Server 2003 R2. The share itself is accessible without problems as long as I try to get to it directly (\\smb\share), but if I try to browse through the DFS I get the "\\DFS\share is not accessible. You might not have permission to use this network resource... Configuration information could not be read from the domain controller, either because the machine is unavailable, or access has been denied" error message. The SaMBa server is part of the Active Directory domain. Also, a similar server with the same software and smb.conf file (different host and share names, of course) works with that same DFS without any problems whatsoever. Both servers are on the same side of the firewall and reside in the same Organizational Unit of Active Directory. The (sanitized) smb.conf file I use is: [global] workgroup = DOMAIN security = ADS netbios name = smb netbios aliases = smb realm = DOMAIN.UK encrypt passwords = yes password server = * server string = Samba shares for smb on %h bind interfaces only = yes hosts allow = *our IP range* interfaces = *smb IP* log file = /var/log/samba/log.%m log level = 1 passdb:2 auth:2 locking = yes lock directory = /var/log/samba/locks pid directory = /var/run private dir = /etc/samba/private username map = /etc/samba/username.map smb passwd file = /etc/samba/private/smbpasswd show add printer wizard = no utmp directory = /var/log encrypt passwords = yes domain master = no preferred master = no guest account = nobody max log size = 1000 syslog = 0 socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192 invalid users = root admin local master = no dns proxy = no panic action = /usr/share/samba/panic-action %d [share] comment = Webservice Documents path = /data/sites/share printable = no browseable = no write list = @sysman valid users = @sysman force user = sysman force group = sysman The log file (sanitized) only reports: [2007/10/12 13:17:45, 0] smbd/map_username.c:map_username(107) can't open username map /etc/samba/username.map. Error No such file or directory [2007/10/12 13:17:45, 1] smbd/sesssetup.c:reply_spnego_kerberos(310) Username STATS\CLIENT$ is invalid on this system Both SaMBa servers have no username.map, and the CLIENT machine works with the other server. Where else should I look for differences between the two SaMBa servers? What is going on? Thank you for your help. David