The message "System error" is coming from PAM.
My first guess is that you have a misconfiguration on your system, but this could also be a PAM bug.
Can you check you /var/log/auth.log for messages from PAM? Can you provide you PAM configuration? (/etc/pam.d/passwd and the files linked from there)
The message "System error" is coming from PAM.
My first guess is that you have a misconfiguration on your system, but this could also be a PAM bug.
Can you check you /var/log/auth.log for messages from PAM?
Can you provide you PAM configuration?
(/etc/pam.d/passwd and the files linked from there)