If you access the Internet through a company network, you can select internal
servers to act as proxies (or gateways) for Internet access through your
network firewall. Using proxies can also improve performance and reduce
network traffic.
To ignore your proxies when connecting to particular hosts, enter the full
host names in the Don't Proxy field, separated by spaces or carriage
returns. Designate an entire domain by starting the name with a period
(e.g. .mycompany.com).