Hello,
I'm using Windows Matlab 2020b. I am attempting to read HTTPS OpenDAP data from matlab behind a proxy.
I can confirm with wget and my web browser that the proxy works for both http and https to the tds.hycom.org domain.
For Matlab, I've set HTTP_PROXY=proxy.mycompany.com:3129 and HTTPS_PROXY=proxy.mycompany.com:3129. I've done this from Windows 10's Settings => Edit Environment Variables for your account. After setting those variables I start a new matlab.
test HTTP, it works:
>> ncinfo('http://tds.hycom.org/thredds/dodsC/GLBy0.08/expt_93.0')
ans =
struct with fields:
Filename: 'http://tds.hycom.org/thredds/dodsC/GLBy0.08/expt_93.0'
Name: '/'
Dimensions: [1×4 struct]
Variables: [1×14 struct]
Attributes: [1×10 struct]
Groups: []
Format: 'classic'
test HTTPS, it fails:
>> ncinfo('https://tds.hycom.org/thredds/dodsC/GLBy0.08/expt_93.0');
Error using netcdflib
The NetCDF library encountered an error during execution of 'open' function - 'I/O failure
(NC_EIO)'. If the data source was an OPeNDAP URL, see the OPeNDAP Troubleshooting section in the
Users Guide.
Error in netcdf.open (line 67)
[varargout{:}] = netcdflib ( 'open', filename, varargin{1} );
Error in internal.matlab.imagesci.nc/openToRead (line 1278)
this.ncRootid = netcdf.open(this.Filename,'NOWRITE');
Error in internal.matlab.imagesci.nc (line 121)
this.openToRead();
Error in ncinfo (line 88)
ncObj = internal.matlab.imagesci.nc(ncFile);
My company's IT has confirmed that Matlab is making the request and getting a response from the server.
Is this a known limitation of the netcdf library matlab is using? Are there additional ways to get debugging information or understand the cause of the failure?
Related posts:
Thank you,
Luke
