Windows – find “system proxy settings”

firefoxPROXYwindows xp

Where are these system proxy settings? I noticed my connection has been slow for a while, then I checked the connection settings and was surprised there were set a proxy, but I cant see what exactly it is using.

Where can I check which IP it was routing the connection for me ?

Here is what I saw from Firefox (12.0) options:

As far as I can remember, it has always been "no proxy" and not "system proxy". Unless new firefox version has set that "system proxy" to default?

Best Answer

The proxy settings can be changed through:

Control Panel → Internet Options (inetcpl.cpl) → Connections → LAN settings

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Why are the browsers suddenly configured to use a proxy

Fiddler could be the cause. I debug my Silverlight application calls via Fiddler and have realised that launching Fiddler does automatically check the "Use a proxy server for LAN" checkbox. Uncheck the box and do not re-launch Fiddler, and all is well (though at times Fiddler does not track the traffic from that browser instance).

Ubuntu – Manually configuring proxy settings of Google Chrome on Ubuntu

You can use the Chromium proxy settings from the command line. The man page tells you how. So here is an excerpt from man chromium-browser from my Ubuntu Natty:

   --proxy-server=host:port
          Specify the HTTP/SOCKS4/SOCKS5 proxy server to use for requests.  This overrides any environment variables or settings picked via the options dialog.  An individual
          proxy server is specified using the format:

            [<proxy-scheme>://]<proxy-host>[:<proxy-port>]

          Where <proxy-scheme> is the protocol of the proxy server, and is one of:

            "http", "socks", "socks4", "socks5".

          If the <proxy-scheme> is omitted, it defaults to "http". Also note that "socks" is equivalent to "socks5".

          Examples:

            --proxy-server="foopy:99"
                Use the HTTP proxy "foopy:99" to load all URLs.

            --proxy-server="socks://foobar:1080"
                Use the SOCKS v5 proxy "foobar:1080" to load all URLs.

            --proxy-server="sock4://foobar:1080"
                Use the SOCKS v4 proxy "foobar:1080" to load all URLs.

            --proxy-server="socks5://foobar:66"
                Use the SOCKS v5 proxy "foobar:66" to load all URLs.

          It is also possible to specify a separate proxy server for different URL types, by prefixing the proxy server specifier with a URL specifier:

          Example:

            --proxy-server="https=proxy1:80;http=socks4://baz:1080"
                Load https://* URLs using the HTTP proxy "proxy1:80". And load http://*
                URLs using the SOCKS v4 proxy "baz:1080".

The advantage of using the command line arguments is, that you do not have to change your global system settings.

For example:

$ chromium-browser --proxy-server="http://127.0.0.1:8080"

Also have a look at Justin's post in this thread where he describes how to use the proxy for DNS request also.

Best Answer

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Why are the browsers suddenly configured to use a proxy

Ubuntu – Manually configuring proxy settings of Google Chrome on Ubuntu

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