There are a large number of different versions of wget in use today, working across a wide range of platforms, so producing a single set of instructions to get it working in all cases is very difficult. If you are having problems downloading files using wget, you can use some of these steps to identify the problem.
Check your .netrc file
In many cases, the .netrc file can be used to configure your Earthdata Login credentials, but if this is not configured correctly, authentication will fail. If your Earthdata Login username is 'john.q.smith' and your password is 'abc123DEF!', then your .netrc should look like this:
machine urs.earthdata.nasa.gov login john.q.smith password abc123DEF!
Try .wgetrc
Try --http-username --ask-password
Try --http-username --http-password
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