I have 2 systems that are member servers in Samba PDC-LDAP domain. Both running CentOS 4.2. Initially setup one server and everything worked fine. Copied over the conf files and modified for the second server. wbinfo -u worked wbinfo -g worked getent passwd worked getent group failed Went over the configuration files again and found no differences in configuration or rpm's installed. Checked configuration against Samba How To by Example and found nothing. restarted samba and winbind. The only error I saw was Mar 19 07:03:00 FILESERVER2 winbindd[25406]: could not lookup domain group IET+Domain Admins Mar 19 07:03:00 FILESERVER2 winbindd[25406]: [2006/03/19 07:03:00, 0] nsswitch/winbindd_group.c:winbindd_getgrent(789) Mar 19 07:03:00 FILESERVER2 winbindd[25406]: could not lookup domain group IET+Domain Users Mar 19 07:03:00 FILESERVER2 winbindd[25406]: [2006/03/19 07:03:00, 0] nsswitch/winbindd_group.c:winbindd_getgrent(789) Mar 19 07:03:00 FILESERVER2 winbindd[25406]: could not lookup domain group IET+Domain Guests Updated samba rpms to samba-3.10-1.4E6 and everything started working correctly as soon as I restarted samba and winbind. I'm still a bit baffled as to the cause. Maybe there's a difference in my gcc versions.