Problem loading HadI-SST

Problem

I try to load HadI-SST from a jupyter notebook (see attached) based on the example_03 in the documentation.

test_load_HadISST.html

Please find in the html file the version of xarray.

Error :

OSError: [Errno -68] NetCDF: I/O failure: b'https://data.geomar.de/thredds/dodsC/tmdata/git_geomar_de_data/HadISST/v1.x.x/data/HadISST_sst.nc'

Can anyone of you load the Hadi-SST dataset ?