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If your internet connection is behind a proxy server (or
"firewall"), you will probably experience difficulty downloading
Keplerian elements with Nova for Windows' FTP function or with NovaFTP.
Here are alternative settings that have worked for others :
Remote Host: enter the name of your proxy server, such as company.firewall
User Name: enter anonymous@ftp.celestrak.com
Password : leave as-is (anything works, usually)