OpenDAP error when using R2021, none with R2019

I have used matlab to access OpenDAP data succcessfully up until R2021a was released. I just used the old R2019a till the next release was installed, thinking it would be fixed. Now we have instralled R2021b and it is still broken. I can load URLs in R2019a, but they fail in R2021b. an example

In R20219a

>> ncinfo('http://gliders.ioos.us/thredds/dodsC/deployments/zerickson/SG539-20141208T0000/SG539-20141208T0000.nc3.nc')

ans =

struct with fields:

Filename: 'http://gliders.ioos.us/thredds/dodsC/deployments/zerickson/SG539-20141208T0000/SG539-20141208T0000.nc3.nc'

Name: '/'

Dimensions: [1×4 struct]

Variables: [1×50 struct]

Attributes: [1×60 struct]

Groups: []

Format: 'classic'

in R2021b

>> ncinfo('http://gliders.ioos.us/thredds/dodsC/deployments/zerickson/SG539-20141208T0000/SG539-20141208T0000.nc3.nc')

Error using matlab.internal.imagesci.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{:}] = matlab.internal.imagesci.netcdflib ( 'open', filename, varargin{1} );

Error in internal.matlab.imagesci.nc/openToRead (line 1280)

this.ncRootid = netcdf.open(this.Filename,'NOWRITE');

Error in internal.matlab.imagesci.nc (line 124)

this.openToRead();

Error in ncinfo (line 88)

ncObj = internal.matlab.imagesci.nc(ncFile);

In the window that matlab was launched from there is a message "curl error details:" This is using-

-----------------------------------------------------------------------------------------------------

MATLAB Version: 9.11.0.1769968 (R2021b)

Operating System: Linux 3.10.0-1160.31.1.el7.x86_64 #1 SMP Thu Jun 10 13:32:12 UTC 2021 x86_64

Java Version: Java 1.8.0_202-b08 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode

-----------------------------------------------------------------------------------------------------

for the R2019a version that works

>> ver

-----------------------------------------------------------------------------------------------------

MATLAB Version: 9.6.0.1135713 (R2019a) Update 3

Operating System: Linux 3.10.0-1160.31.1.el7.x86_64 #1 SMP Thu Jun 10 13:32:12 UTC 2021 x86_64

Java Version: Java 1.8.0_181-b13 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode

-----------------------------------------------------------------------------------------------------

I can give other examples that fail. R2021 can read the exampled supplied in the opendap hyrex documentation http://test.opendap.org/dap/data/nc/ , but fails for the data I am trying to read. Like here is another example

ncdisp('https://psl.noaa.gov/thredds/dodsC/Datasets/nodc.woa98/temperat/annual/otemp.anal1deg.nc')

Thanks for any guidance.

[Reggie Walters]

Hello,

Just curious if you ever found a solution to this? I have a coworker who had nc commands working fine in 2018a and is now experiencing similar errors with 2022a.

[Erik]

No solution. Our IT people weren't interested in finding a solution, since I was the only person using opendap . It might involve some linux security issue.