How do I find which proxy and port I am connected to?

Question

I believe that I am connected to a proxy over a vpn connection. Where can I find which proxy I am connected to and ports

Answer 1

You may use curl to investigate it:

 curl -v http://askubuntu.com/questions/267104 >/dev/null

In the output you will see:

X-Cache: MISS from proxy.example.org
X-Cache-Lookup: MISS from proxy.example.org:3128
Via: 1.0 example.computer42.org (squid)

Also you may investigate the configuration of your web browser, if the proxy configuration is part wise automated, but the shell environment stuff used by curl is forgotten.

To get an idea how this automatic configuration may be done, have a look here:
Set web proxy using pac-file-url