Try downloading the actual file in mozilla and firebird, just type the address of the PAC file in the address bar, open this file in textedit and try to recognise some of the information. This is how i did it and it worked, universities sometimes use other ports ( like 8002 instead of 8080 ) or different servers for secure sites ( sproxy. .... instead of proxy. ... ) I really wish the OS itself would support PAC files...