Vsftpd is a widely used ftp server, and if you are setting it up on your server for transferring files, then be aware of the security issues that come along. The ftp protocol has weak security inherent to its design. It transfers all data in plain text (unencrypted), and on public/unsecure network this is something too risky.
To fix the issue we have FTPS. It secures FTP communication by encrypting it with SSL/TLS. And this post shows how to setup SSL encryption with vsftpd.
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