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We used perl script to download hourly data before, however, in the https://cddis.nasa.gov/Data_and_Derived ... ccess.html, there is no instructions about how to use perl script to download. We tried to use username (anonymous) and password (our email address), but it doesn't work.
To change from using ftp to ftp-ssl in a Perl script, you will need to change more than just the URL. You will need to use a different library such as Net::FTPSSL. You can also make the calls via HTTPS using something such as Net::HTTPS or use another library like Net::Curl. No matter which way you go, it will likely require some modification of the Perl source code.