Debugging PAM configuration

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Make a backup of your existing system-auth-ac file:

mv /etc/pam.d/system-auth-ac{,-orig}
cp /etc/pam.d/system-auth-ac{-orig,}

This will keep the original with its existing time stamp.
Reset the SELinux label for the new file if SELinux is enabled:

restorecon -vvRF /etc/pam.d/system-auth-ac

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