All my users dropped off the system today. Error message received was "No Security Device Found" "mesg: no tty". However, if each user logged on as "root" they were able to access the system and continue working. After shutdown and reboot...no change. Immediately after mounting the filesystem during reboot, the following message appeared: "auditd:error on open of read audit device" I'm running SCO UNIX 3.2.4 V 5. I've at a loss here. I do know I don't want 64 users logged on as root. Note: when ps -ef |pg is used some of the users processes are displayed as <defunct>. All passwords are lifetime.