Note: To begin it is necessary to run vsftpd (Very Secure File Transfer Protocol Daemon).

1. Generate CSR file using OpenSSL.
2. Select Other from menu, when prompted which type of server you are using.
3. Find a .zip file in the e-mail with your certificate. It contains Root certificate and Intermediate SSL. You have to concentrate it to one file (.pem). Use a command and stay with this order:
# cat your.server.crt UTNAddTrustExternalCA.crt AddTrustExternalCA.crt > your.server.pem
4. Move the file where you keep certificates (usually it is /usr/share/ssl/certs/).
5. Open vsftp.conf file (default location is /etc/vsftpd/vsftpd.conf) with text editor and add following line rsa_cert_file /path/to/your.server.pem
6. Restart vsftpd with

# /etc/init.d/vsftpd restart
or
# /sbin/service/vsftpd restart
or
# killall vsftpd
# vsftpd

7. Your vsftp server is secure now.

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