In our environment we have a previously deployed ISA Server that we pushed users to via GPO into the autoconfigure script portion of the settings in IE.
However we are looking to migrate to a cloud based web filtering solution so we have to put thier proxy settings into the browser. I am planning to do this via a pac file.
I have the pac file crafted and it works correctly with firefox or a virgin install of IE ( never had our ISA configuration pushed to it ).
However if i change the configuration in the browser to somehting other than our ISA server the traffic still continues to "remember" the ISA server . I can witness this via ip checking sites.
Any idea where this information is hanging out and how to get rid of it to force my new pac file to actually be read in and utilized?