This FTP server is automatically installed on your VPS. For convenience it is configured to allow root connections via FTP but you should disable this for security reasons and set up your own users and shared folders.
- edit the
/etc/vsftpd.userlist
and remove the root user - edit the
/etc/ftpusers
and uncomment or add root - edit the
/etc/vsftpd.conf
file and remove the lineallow_writeable_chroot=YES
, then restart the service withsystemctl restart vsftpd
You can find more info and guides about VSFTPD on this page.