Si teneos un plesk reciente tan sencillo como configurar en la zona de herramientas y utilidades, Certificados SSL -> Añadir certificado, lo pegamos. Y por ultimo lo seleccionamos y lo activamos para proteger el plesk haciendo click en su boton y en hacer preterminado.. EN caso contrario entrar en el fichero /etc/proftpd.conf y añadir ???????


        # common settings for all virtual hosts
        TLSEngine on
        TLSRequired off

        TLSLog /var/log/plesk/ftp_tls.log

        TLSRSACertificateFile /opt/psa/admin/conf/httpsd.pem
        TLSRSACertificateKeyFile /opt/psa/admin/conf/httpsd.pem

        # Authenticate clients that want to use FTP over TLS?
        TLSVerifyClient off

        # Allow SSL/TLS renegotiations when the client requests them, but
        # do not force the renegotations.  Some clients do not support
        # SSL/TLS renegotiations; when mod_tls forces a renegotiation, these
        # clients will close the data connection, or there will be a timeout
        # on an idle data connection.
        TLSRenegotiate none

        # As of ProFTPD 1.3.3rc1, mod_tls only accepts SSL/TLS data connections
        # that reuse the SSL session of the control connection, as a security measure.
        # Unfortunately, there are some clients (e.g. curl) which do not reuse SSL sessions.
        TLSOptions NoSessionReuseRequired