I am trying to create a proxy autoconfig file to be distributed to my
campus network. I have two sets of IP ranges in use in different
buildings. One set is in use by staff, one set is in use by students. I

also am running two proxies, one for staff and one for students. I am
only trying to send SSL connections to the proxies, as I have
transparent proxying on port 80. The reason for creating this script
instead of manually setting the proxy is so that laptops that will
travel off campus will still be able to access the internet. Here is
the script:

//----Begin proxy.pac----
//---- Alerts are currently commented out, but are
//---- there for debugging purposes
function FindProxyForURL(url, host) {
if (url.substring(0, 6) == "https:") {
if (isInNet(myIpAddress(), "", "") ||
isInNet(myIpAddress(), "", "") ||
isInNet(myIpAddress(), "", "")) {
//alert('Staff\n' + url);
return "PROXY 10.x.x.x:8080";
else if (isInNet(myIpAddress(), "", "") ||
isInNet(myIpAddress(), "", "") ||
isInNet(myIpAddress(), "", "") ||
isInNet(myIpAddress(), "", "") ||
isInNet(myIpAddress(), "", "") ||
isInNet(myIpAddress(), "", "")) {
//alert('Student\n' + url);
return "PROXY 10.x.x.x:8081";
else {
//alert('Direct\n' + url);
return "DIRECT";
//alert('No proxy!\n' + url);
//----End proxy.pac----

This code is working perfectly as expected in Firefox and Opera, but
yeilds very weird behaviour in Internet Explorer. In many cases, the
page will fail to load in less time than a DNS resolution takes to
complete. Other times, a page will load devoid of all images and most
formatting. I have found and disabled the "EnableAutoproxyResultCache"
value in the registry, but still no luck.

Does anybody have any suggestions? Thanks.

Ben Miller