To secure FTP connections to your server, Plesk supports the FTP Secure (FTPS, FTP-SSL/TLS) protocol. Plesk gives you the ability to allow secure, plain, or both secure and plain FTP connections to the server.
To configure the allowed FTP connections, go to Tools & Settings > Security Policy. We recommend that you only allow FTPS connections. Note that it is required to comply with the PCI DSS standard.
By default, Plesk supports explicit FTPS only. However, you can turn implicit FTPS on if you wish. See the FTP section of the Advanced Administration Guide for Linux, or the Switching On Implicit FTPS section of the Advanced Administration Guide for Windows for more details.
If you are using Plesk for Windows, you have the option to configure the FTPS policy separately for each IP address. To do so, go to Tools & Settings > Security Policy and select the Use custom FTPS policy per IP address option. After that, go to Tools & Settings > IP Addresses. Click the IP address for which you want to configure the FTPS policy and select the desired option under FTPS usage policy.