The proxy server acts as a mediator between the client machine and the main server. Requests sent from the client machine are first routed to the proxy server. These requests are then validated based on a series of filters. If the request is valid then the proxy server allows the client machine to retrieve the information from the source requested. Some of the uses of a proxy server are to restrict users from visiting specific websites, scan outbound content or restrict file and folder access depending on the client machine's security level.
Open the Internet Explorer browser.
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Click on the "Tools" down arrow, and select the "Internet Options" option.
Click the "Connections" tab.
Click the "LAN settings" button. The "Local Area Network (LAN) Settings" window will open. The proxy port number will be in the box labeled "Port."
Open the Firefox browser.
Click the "Tools" menu and select the "Options…" option.
Select the "Advanced" icon.
Click the "Network" tab.
Click the "Settings…" button. The "Connection Settings" window will open. You can find the proxy port number in the "Port" box next to the "HTTP Proxy:" section.