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I've installed Squid and DansGuardian and configured both correctly. Content is being blocked as appropriate, except where it isn't. Certain search engines, including Google and DuckDuckGo, are able to bypass both the phraselists and the bannedregexpurllist.
I've written a detailed question on Server Fault about it. So if you think you might be able to help me out, take a look.
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My guess is the search engines load the results using javascript, perhaps one at a time so that your filter isn’t triggered.
Cross-posting is bad.
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