> curl --proxy "http://proxyuser:******@psproxyurl.smth.tok.eu.int:8012" --ftp-pasv --proxytunnel 'ftp://ftpuser:ftppassword@ftp-2-cdn.fileservers.net:21'  -v
* Protocol 'ftp not supported or disabled in libcurl
* Closing connection -1
curl: (1) Protocol 'ftp not supported or disabled in libcurl