====== ftpd-tls ======
產生憑證，並放在 /etc/ssl
  # cd /etc/ssl
  # openssl genrsa -out server.key
  # chmod 400 server.key
  # openssl req -new -key server.key -x509 -days 3650 -out server.crt

安裝 ftpd-tls
  # cd /usr/ports/ftp/ftpd-tls
  # make install clean

如果沒有用過 inetd，要先修改 /etc/rc.conf，加入
  inetd_enable="YES"

修改 /etc/inetd.conf，加入一行
  ftp stream tcp  nowait root /usr/local/libexec/ftpd-tls ftpd-tls -4lU -z rsacert=/etc/ssl/server.crt -z rsakey=/etc/ssl/server.key

啟動(重新啟動) inetd
  # /etc/rc.d/inetd restart