I have an issue where ispconfig 3 control panel loads for a long time then finally works. I can see most the options and even log in but its just theres a white box with a loading animation and some links don't work until it's done. My best guess is it's trying to check for updates or reach other external URLs but can't because it's behind a proxy. How do I configure ISPConfig 3 to use a proxy when checking for updates etc. Like I did for YUM and the other applications. I'm using it as an internal webserver for some tools.