Reference

http://www.wu-ftpd.org/ wu-ftp official website.

http://www.cert.org/ Computer emergency response team.

http://www.openssh.com/ OpenSSH home page and source for the latest version of OpenSSH and its component clients, such as sftp.

http://www.cert.org/tech_tips/anonymous_ftp_config.html CERT anonymous FTP configuration guidelines.

http://vsftpd.beasts.org/ Home page for the vsftd FTP server.

ftp://vsftpd.beasts.org/users/cevans/ Download site for the latest releases of the vsftpd server.