Hi, not absolutely sure whether this is a samba or a OS issue. After joinning a Samba domain (2.2.12) with XP or Win2k with the adduser script /usr/sbin/useradd -d /dev/null -g machines -c 'Machine Account' -s /bin/false -M %u the group machines disappears and a reboot failed with the error dup2 bad file descriptor. Thanks for your suggestions how to stop this Arne