I would like to be able to import/read a file into Mathematica from an ftp server that requires explicit TSL security with anonymous connection.


In other words, I want to connect to server gdc.cddis.eosdis.nasa.gov, and download, for example, /pub/products/iers/finals2000A.all.

or under https:


Help on this is provided here: https://cddis.nasa.gov/Data_and_Derived_Products/CDDIS_Archive_Access.html, but unfortunately there is nothing specific for Mathematica.

I can't get it to work with Mathematica (Import/URLRead/Authentication ...). Could anyone give me an idea on how to do it?

  • $\begingroup$ Why not use curl or wget to download the file and then Import? If you can get either to work then you can call them from WL and Import. $\endgroup$ Dec 18, 2020 at 18:02
  • $\begingroup$ The link you provided has instructions for curl and wget using either https or ftp-ssl. I don't have an Earthdata account so I cannot test them. curl and wget are command line tools. $\endgroup$ Dec 18, 2020 at 18:18
  • $\begingroup$ I was able to download the file without any problems using your Import["ftp://gdc.cddis.eosdis.nasa.gov/pub/products/iers/finals2000A.all"] verbatim. The result was a string of StringLength 3372719. Adding the option "Table" to the Import gave me a list of 17940 sublists. The first sublist was {73, 1, 2, 41684., "I", 0.120733, 0.009786, 0.136966, 0.015902, "I", 0.808418, 0.000271, 0., 0.1916, "P", -0.766, 0.199, -0.72, 0.3, 0.143, 0.137, 0.8075, -18.637, -3.667}, I did not visit the website itself and do not have any account or credentials that I know of. MMA 12.1.0 for Linux. $\endgroup$
    – LouisB
    Dec 18, 2020 at 19:26
  • $\begingroup$ @LouisB Do you have an account to that database, and were you signed in to it? It did not work for me (FetchURL: the connection cannot be opened for ftp; a login page for https). $\endgroup$
    – MarcoB
    Dec 18, 2020 at 19:33
  • $\begingroup$ @MarcoB I do not have an account for the database. I was able to get the "FetchURL: ..." error message using MMA 11.3.0 for Microsoft Windows 10. When I tried to access the FTP server via the Windows FTP command, the server gave me "530 Anonymous sessions must use encryption". I tried curl and wget on my Linux box and both of those got "530 ..." from the server. $\endgroup$
    – LouisB
    Dec 18, 2020 at 20:13


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