It seems to me that a similar problem occurs on Linux. Basically, everyone who uses proxy servers, they do it on Windows, because there will be fewer problems. By the way, you should review your config, because there are probably errors there. So try to search the Internet for a detailed guide on configuring proxy servers, I think this will help you. And yet, even if you work on Linux, try to set up the servers first on Google Chrome, and not on Konqueror, because it's much easier, as it seems to me.
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