The Goddard Earth Sciences Data and Information Services Center (GES DISC) will soon be completing its transition from FTP access to HTTPS access using NASA Earthdata Login. This transition will require GES DISC users to register with NASA Earthdata Login if they haven't already done so.
To learn more about NASA Earthdata Login and registering for an account, please see https://wiki.earthdata.nasa.gov/display/EL/How+To+Register+With+Earthdata+Login
GES DISC will begin this transition starting Feb 13 2017, and expects to complete the transition mid-March.
Users who currently access GES DISC data via FTP through scripts will have to adjust those scripts to use HTTPS access using NASA Earthdata Login. Information regarding the latter may be found here: https://disc.gsfc.nasa.gov/recipes/?q=recipes/How-to-Download-Data-Files-from-HTTPS-Service-with-wget
If you have any additional questions, please contact the GES DISC Help Desk at email@example.com.