You cannot access a private media FTP server with just a web browser. You need:
When users access cdn1.discoveryftp.net through a BDIX-connected ISP, the data stays within the local Bangladesh network. This allows for blazing-fast download speeds that often bypass the normal limits of a user's internet package. How the Journey Looks for a User cdn1.discovery ftp
nmap -p 21 cdn1.discovery.com