What port uses my backportpackage or bzr?

I am working in a company what uses Ubuntu Precise on the desktops behind a proxy. The Proxy is available in /etc/environment and set as: http_proxy, https_proxy, ftp_proxy, no proxy and their uppercase versions.

So actually i have a problem with using some applications inside the Bash. If i'm using backportpackage (like backportpackage -s trusty -d precise fop) or bzr branch then just comes up a timeout.

Now i'm guessing that the programs trying to use an unsupported (from Proxies Firewall) Port. But if i can find out what port it uses, i can ask the Admins for opening the port.

May anyone can help with this?