Hello, A while ago I downloaded and compiled PAM 0.99.x and installed it over the default CentOS PAM installation. Of course, this premature decision led to root and FTP access being fully locked down and inaccessible. When I `su -`, it prints "su: incorrect password" before it gives me the chance to type a password. When I `sudo su -`, it prints "sudo: pam_authenticate: Module is unknown". The most elaborate error from that point on is in /var/log/secure, which prints the following when I supply valid FTP log in credentials: Nov 24 19:57:07 ded sudo: PAM unable to dlopen(/lib/security/pam_stack.so) Nov 24 19:57:07 ded sudo: PAM [error: /lib/security/pam_stack.so: undefined symbol: _pam_make_env] Nov 24 19:57:07 ded sudo: PAM adding faulty module: /lib/security/pam_stack.so I've tried reinstalling PAM via yum, it's dependencies, and it's furthest dependencies with no apparent success. Does anyone know how this can be fixed without formatting the entire system? Thanks, --ness