As now all is moving to https it's also good to enable SSL/TLS for FTP to protect plain text login credentials.
Our instruction will guide you to install and configure pure-ftpd to use SSL/TLS.

Requirements: Hostname certificate already installed, check that these files exist:

Create Certificate File for pure-ftpd

cat /etc/pki/tls/private/hostname.key > /etc/pki/tls/private/pure-ftpd.pem
cat /etc/pki/tls/certs/hostname.crt >> /etc/pki/tls/private/pure-ftpd.pem
chmod 600 /etc/pki/tls/private/pure-ftpd.pem

Edit File: /etc/pure-ftpd/pure-ftpd.conf end set this values:

TLSCipherSuite HIGH
CertFile /etc/pki/tls/private/pure-ftpd.pem

Available options :
TLS 0 : disable SSL/TLS encryption layer (default on install).
TLS 1 : accept both traditional and encrypted sessions.
TLS 2 : refuse connections that don't use SSL/TLS security mechanisms, including anonymous sessions.

In the latest centos7 version you can install it with command:

sh /scripts/install_pure-ftpd_tls

How to connect
FileZilla example details
Host: ftpes://HOSTNAME
Username: USERNAME
Password: PASSWORD
Port: 21