Ubuntu 12.04.5 LTS (Precise) 32-bit desktop.
I have installed burp (an intercepting Proxy), and it works for
programs run from the same computer, but when I try to connect from
another computer on the same network, I get "The proxy server is refusing connections" error.
I also tried squid3, but could not get it working: it refuses connections even from the same computer.
How do I set up a proxy on an Ubuntu Precise Desktop system to use it from different computers?