Instead of installing with VSFTPD package to configure the FTP service we can use the default SSH service and port 22 for secure file system protocol. This will secure the file transfer with added encrypted method which used in default SSH configuration.
first, add a group
# groupadd secure_ftp
Add the user to newly created Group
Note: User will not be added in Sudo, Don’t try with current user which you have logged in if so you will loose the admin privileges
# usermod -G secure_ftp sysadmin
Edit the ssh configuration
# vim /etc/ssh/sshd_config
Comment the following line to add a new line below that
#Subsystem sftp /usr/lib/openssh/sftp-server
Add this line below the Subsystem.
# Subsystem sftp internal-sftp
Append the below chroot config.
Match Group secure_ftp
Restart the ssh service
# sudo service ssh restart
Now login from client machines
# sftp email@example.com
This will work using default ssh with the port (22).