[ Thanks to Ramsai
for this link. ]
“If you use the internet at your workplace or school
then chances are likely that you are using it through a proxy
server, which allows for website filtering, port whitelisting and
overall control of internet use. Your user account on the network
is that you use to authenticate to the proxy, allowing simple
identification. Ubuntu is quite good at handling connections
through these proxy servers, but sometimes situations can be very
difficult. This article by Delan Azabani details how to get the
most out of restricted internet on Ubuntu (or any other Linux
operating system), using package managers, ssh, scp, and X
forwarding.“The basic setup
“This article will be based around a typical workplace or school
you’ll find almost anywhere. There is a proxy server wedged between
users and the internet, as well as Windows throughout for the
servers, meaning Windows-based NTLM authentication. With the advent
of Linux servers and even Linux operating systems being deployed on
desktops, the problems with proxy servers may not become non-issue
quite soon.“Outgoing connections are blocked on all ports but 80 and 443
(those defaulting for HTTP and HTTPS) to ‘help’ security, creating
a problem for those using various services such as games, chat and
peer-to-peer sharing.”