eg. going to https://oceandata.sci.gsfc.nasa.gov/Ancillary/Attitude-Ephemeris/2018/215/PM1ATTNR_NRT.A2018215.0235.061 produces a 404 error page, as does https://oceandata.sci.gsfc.nasa.gov/MODIS-Aqua/L1/2018/183/A2018183013500.L1A_LAC.bz2 and, well, everything else I go to through that page. The "getfile" links still work if you know which files you want (which means the file search still works), so the files are there, but the links are broken (and look to have been so since around the middle of Wednesday, GMT).
Thanks for the quick response, but I'm still getting 404s (eg tried https://oceandata.sci.gsfc.nasa.gov/Ancillary/Attitude-Ephemeris/2018/214/PM1ATTNR_NRT.A2018214.1540.061). These are files I didn't try previously, so shouldn't be caching at my end.
The files are not accessible directly via that URL.
If you hover your mouse over the link on the page, you will see that the file URL points to the getfile call:
That is the URL you need to fetch with wget or curl.