My institute uses the Squid proxy server and authentication mechanism requires username and password to be entered. This means that, I can log in on only one machine at a time and Internet access for me is restricted to that machine. I sometimes require Internet access on multiple machines simultaneously.

What previosuly worked for me was the following : On one of my own machines A, I set up a Squid proxy server that allowed all local machines without any username and password. I configured rest of the machines to use this machine A as the proxy server. On machine A I logged into the institute proxy server using my browser. This way, I could access Internet from all my machines, by effectively channeling my requests through the server A.

Recently, I lost that machine and configuration and now I tried to set it up again in the same manner. However, I cant seem to remember exactly how I made it work.

I keep getting Connection Refused (111) on other machines. My guess is that my squid server isnt able to forward requests from other machines to the actual squid server.

I could use any help for debugging this problem.

I don't want to use alternatives such as ssh tunneling. This solution has worked for me in the past, I just don't remember how to set it up the same way again.