html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/issues/3080#issuecomment-508833311,https://api.github.com/repos/pydata/xarray/issues/3080,508833311,MDEyOklzc3VlQ29tbWVudDUwODgzMzMxMQ==,5852283,2019-07-05T18:23:03Z,2019-07-05T18:23:03Z,CONTRIBUTOR,"I think you're right, this is nearly the same issue as #2850. Your dataset has an attribute named _NCProperties which is one of the [hidden/forbidden attributes](https://www.unidata.ucar.edu/software/netcdf/docs/file_format_specifications.html#atts_spec). 

If I remove the attribute:
`del dsSel.attrs['_NCProperties']`

`dsSel.to_netcdf(outnc)` then works for me with no errors.

You can also delete the attribute on `ds` instead and subsequent selections should also work. 

As an aside, if I run
`ncdump -h https://pavics.ouranos.ca/twitcher/ows/proxy/thredds/dodsC/birdhouse/cccs_portal/indices/Final/BCCAQv2/tg_mean/YS/rcp26/simulations/BCCAQv2+ANUSPLIN300_bcc-csm1-1_historical+rcp26_r1i1p1_1950-2100_tg_mean_YS.nc `
""_NCProperties"" doesn't show up in the attributes, but I assume this is because ncdump hides it and not because it gets added by xarray or netcdf4. If that's not the case it could be a bug in xarray or netcdf4. ","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,464315727