I googled and find the similar problem
code is as follows:
import xarray as xr
data = xr.open_dataset(files,cache=False,engine='netcdf4')
xarray version 0.15.1
in ubuntu, failed with NetCDF Access failure
and I use echo "HTTP.VERBOSE=1" > .dodsrc to show the URL as you guys
told in previous
* Hostname thredds.atmos.albany.edu was found in DNS cache
* Trying 22.214.171.124...
* TCP_NODELAY set
* Connected to thredds.atmos.albany.edu (126.96.36.199) port 8080 (#14)
> GET /thredds/dodsC/CFSR/2016/u.2016.0p5.anl.nc.dods?u.u HTTP/1.1
it appears to send  to server.
So is this the problem? how can I bypass this?
But why the same code works fine on my windows machine?
Thank you very much!