Hi, My FC5 / KDE box is part of a Windows 2000 domain. I've configured it to authenticate login credentials against Active Directory and it's working well. However, when I lock the desktop (manually or via password protected screen saver), I can not unlock it if the logged in user is an Active Directory user. kdesktop_lock fails with the following message: "Cannot unlock the session because the authentication system feiled to work; you must kill kdesktop_lock (pid_of_process) manually" A local user can unlock the desktop without problems. Any idea about what may be causing this? Here is may pam configuration for kcheckpass (/etc/pam.d/kcheckpass): #%PAM-1.0 auth sufficient pam_timestamp.so auth include system-auth account required pam_nologin.so account include system-auth password include system-auth session include system-auth session required pam_loginuid.so session optional pam_timestamp.so session optional pam_selinux.so session optional pam_console.so Also, /usr/bin/kcheckpass permisions are set as 4755. Thanks, Marcelo