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Sorry for being so obtuse. Let me paraphrase what you are saying to see if I understand it. 1. You are executing ncdump via an exec command inside a php file that is executing on the server. This means that ncdump is being executed on the server also. So no client side code is being executed at all. 2. The url in question is this one: http://dods.ipsl.jussieu.fr/cgi-bin/nph-dods/brocksce/ATM_t2m_global_ave_small.nc When I run ncdump using that url here at unidata, it works correctly. So, Please report back to me the following information. 1. If you directly run the command home/webservices/test_ferret/netcdf-4.1.1/bin/ncdump -h http://dods.ipsl.jussieu.fr/cgi-bin/nph-dods/brocksce/ATM_t2m_global_ave_small.nc on the server in the same directory where the php command would execute it, does it report a netcdf error? 2. Was the netcdf library that ferret was using compiled with the --enable-dap flag? =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: DOE-704686 Department: Support netCDF Priority: Normal Status: Open