Depending on which version of netcdf you are using, there are potentially two temporary file being used. The problem ultimately is that there is no good equivalent of the Unix /tmp directory under windows. The problem should be fixed in 4.2.1-rc1 because it now used the NC_DISKLESS capability so that it builds temporary files in-memory instead of using a temporary file. If you are seeing this behavior with 4.2.1-rc1, then it is a bug that needs to be fixed. If you are using 4.2 or earlier and have a directory that can be treated as /tmp, then we can publish some fixes. But first, try this: put the string "[fetch=memory]" at the front of your url like this: url='[fetch=memory]http://geoport.whoi.edu/thredds/dodsC/bathy/adria15' and see if it still fails. The second thing to do is edit the file libdap2/nccommon.h and change PSEUDOFILE to something else. Note it currently assumes "/tmp" because windows support went away a while ago and has only now returned in 4.2.1 where (I hope) the problem no longer exists. =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: JON-360369 Department: Support netCDF Priority: Normal Status: Closed