Proxy server software can be configured by the administrator to listen on some specified port. Let's say you're behind a firewall that is configured to allow connection only on port 80 i.e. standard port for http protocol requests. If you have such configuration you can't use proxies that is configured to work on port number 3128 or 8080.

The web proxy is a server that sits between the LAN PCs and Internet sites. Clients make requests to the proxy which communicates with external sites, then send the response back to the client. The advantages of a web proxy are: ability to filter content; reduce bandwidth usage by caching the pages you visit; The proxy can be enabled only on US Proxy List - Free Proxy List HOT Buy Proxy List One-click to get thousands of HTTP(S) proxies with custom format and filters (anonymity, HTTPS, country, port). Use our free App or API to … How to Configure a Proxy Server on Android Jul 12, 2017

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An anonymous web proxy enables you to access blocked websites and appear anonymous at the same time. It does this by hiding your IP address (which is essentially your online identity) and providing you with a different one by routing your web activity through different servers and IP addresses. MikroTik Router Web Proxy Configuration - System Zone Aug 28, 2016