I really hope that someone here. I'm setting up an Ubuntu server behind a corporate firewall. I'm trying to get repositories to work. The problem I have found it that it is not that straight forward. For archive.ubuntu.com I have opened firewall ports 80 and 443, but then you also need port 11371 to keyserver.ubuntu.com. There are plenty more addresses and ports that needs to be opened to get everything to work properly.
So my main question is, is there a comprehensive list of all addresses and ports that need to be open in a cooperate firewall for apt to work?