For an out-of-box Centos install that utilizes PAM for xscreensaver within both gnome and kde, what factors would lead to xscreensaver not being able to properly unlock the user? I reviewed the logs and nothing helped. I performed ldd on xscreensaver and an ls -l on each dependency proved they were all there. The system uses local /etc/passwd and /etc/shadow files for authentication - no NIS or LDAP or Kerberos. If Xwindows was to be disabled, and only tty was used, what would be the best option for ensuring the logged-in session was locked after a determined amount of inactivity> Also, if the user stepped away from the system and wanted to manually lock it, what is the best tty screen-locking utility? I reviewed vlock, but after prompting me for my password, it then prompted for root's. That was less than helpful. Thanks. Scott