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can you provide both commands that you run? and do they repeatably fail for NT and succeed for NRT?
My point is that the network problem could have been intermittent and coincidentally happened at the the time you were pulling ancillary for the NT files.

Tommy

The intermittent errors seem to be due to a server timeout:
host='oceandata.sci.gsfc.nasa.gov', port=443): Read timed out. (read timeout=10.0)
Is your internet connection stable?

If you run both queries on the command line does NR work and NT fail.

Tommy

We are using those SPARE flags in OLCI L2 files to generate internal statistics and to test new flags.
They do not affect binning or mapping of the products.

Tommy

working now, thanks for your prompt reply

Tommy

It is a sha1sum
sha1sum AQUA_MODIS.20230101.L3b.DAY.CHL.nc
35836abcb24a9290aec0926f5fed35c35045c676 AQUA_MODIS.20230101.L3b.DAY.CHL.nc

Tommy

We use the NRT notation because QuickLook is long to put in the file name. The NRT files run as soon as the L1 data are available from the satellite, using any available ancillary or climatological met / ozone data. The refined data wait for the refined MERRA2 ancillary and updated calibration. If y...

NRT files are readily available in file search.
Just select Data Type "All" or "Quicklook Only" and check the box next to "Include checksum with file name"

Tommy

No - the browser usually has its own cache of saved passwords. But this was just a way to demonstrate the need for authentication. I am not a Matlab user, but hopefully someone else can walk you through the steps for obtaining and using an access token in Matlab.

Tommy

Try accessing the OPeNDAP URL with a fresh web browser window. See if there is a user authentication step that Matlab is not handling.

Tommy

tads1 MODIS PM1ATTNR.003/ not updating since 2023-05-09 15:00Z