You need to clear your browser cache for the proxy to work. Follow these instructions to do so.
chrome://settings/clearBrowserData into your search bar
Go to the basic tab and select
Cached images and files
Clear Data button.
Follow the directions below to configure your proxy in Chrome.
chrome://settings/system into your search bar
Open proxy settings and follow the specific instructions for your operating system.
Follow the specific instructions for your operating system to set up Automatic Proxy Configuration via the URL https://pac.tjhsst.edu