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When Windows Internet Properties -> Connections -> LAN Settings -> Automatic Configuration is set to "Automatically detect settings" how does Windows actually determine/discover what the settings are? Is it a network broadcast or some kind of targeted query to a server configured somewhere in the registry, or something else?
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When a connectoid changes (for example, a wireless connection changes an access point, or a VPN is enabled), the proxy detection algorithm is run again. By default, the Internet Explorer proxy settings are used to detect the proxy.
Browsers are often configured to automatically detect settings as a convenience for networks that use proxy servers. Most of us don't need this. don't know about proxy.
Its simple: Browsers (Firefox works the same) query GET http://wpad/wpad.dat.
If a web server named wpad is resolveable, it should serve wpad.dat, a script file analog to netscape PAC files. MIME type must also be "application/x-ns-proxy-autoconfig".
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