We don't support FTP over TLS. You need either SFTP (SSH-secured FTP, not to be confused with FTPS, which is another name for the unsupported FTP over TLS), or plain unencrypted FTP. The recommended settings are SFTP using these settings: Host: johnny.heliohost.org Port: 1373 Username: (your cpanel username) Password: (your cpanel password). If you use the "additional" FTP accounts that you create in cPanel, they support plain unencrypted FTP only. Those accounts need to use port 21 with no encryption, and you need to specify the entire username shown (usually in the form ftpaccount@mydomain.heliohost.org like an email address would be).