Vsftpd Configuration
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vsftpd is the default FTP server for Red Hat and thus CentOS.
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Requiring SSL
To mandate SSL, add the following lines to your vsftpd.conf file. For RHEL/CentOS, this file is typically at /etc/vsftpd/vsftpd.conf
enable_ssl=YES force_local_logins_ssl=YES force_local_data_ssl=YES
