Instead of having separate proxy settings in Group Policy for several web browsers (Google Chrome, Internet Explorer and FrontMotion Firefox), I decided that it would be better to create a proxy.pac file and point each browser at that via Group Policy. This way, I would only have to update exclusions in one place.
My first thought was to put the proxy.pac file on the server that hosts our intranet. But this would give me no load balancing or resiliency. I tested this anyway and it worked (after adding a mime type to IIS). The URL looked like http://example.com/proxy.pac.
My second thought was to put the proxy.pac file into our SYSVOL directory. No way, no how can I get this to work. There's obviously something I've missed! The URL looks like file://\\example.com\SYSVOL\example.com\Proxy\proxy.pac. I also tried file://example.com/SYSVOL/example.com/Proxy/proxy.pac.
Where do you put yours? Any idea what I'm doing wrong?