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Michael, Via Google, we found an old message concerning this issue. Have you tried this: http://www.unidata.ucar.edu/support/help/MailArchives/idv/msg00493.html You will have to edit your runIDV(.bat) script. It is curious that your security configuration *will* allow communication to ADDE (via port 112). Best, Unidata IDV Support > Full Name: Michael McAtee > Email Address: address@hidden > Organization: The Aerospace Corporation > Package Version: 5.0 > Operating System: > Hardware: > Description of problem: > > My company requires internet access (port 8080) to go through a proxy > server. This proxy server requires authentication (userid and password. > I can run IDV and get to Point Raob, and Images data via adde.ucar.edu. > However I cannot connect to Catalogs. When I try I get the following > error message: > > Error: Could not load > url:http://www.unidata.ucar.edu/georesources/idvcatalog.xml > > When I'm at home on the same system going through my home network (not > through a proxy) everything works fine. I'm pretty sure the issue > is the proxy server. Any assistance you can provide would be greatly > appreciated. I would have sent this request via help on IDV itself but > that connection doesn't work either. > > > Ticket Details =================== Ticket ID: FNT-602075 Department: Support IDV Priority: Normal Status: Closed