vsFTPd

читаем man:

vsftpd_log_file
This option is the name of the file to which we write the vsftpd style log file. This log is only written if the option xferlog_enable is set, and xferlog_std_format is NOT set. Alternatively, it is written if you have set the option dual_log_enable. One further complication - if you have set syslog_enable, then this file is not written and output is sent to the system log instead.

Default: /var/log/vsftpd.log

такой же вопрос!