You did not reset the root password, according to the error message you reset the password for the ispconfig user. This wa a very bad idea because this password is used in many config files all over the operating system. Take a look at the files in /etc/postfix, /etc/courier, /etc/pam.d/, /usr/local/ispconfig/server/lib/config.inc.php and /usr/local/ispconfig/interface/lib/config.inc.php
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