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The W3C Link Checker, when I entered <http://cold32.com>, allowed 10 levels of recursion (more than needed), and set it to send the Referer, said that, because of robots.txt exclusion, it can't check a link that isn't in robots.txt and isn't a link, but is a URL appearing only in the source code of most of my pages. The URL was supplied by Google as part of its advertising program, so I can't change it without probably breaking the advertising service. Since it's not a link, it shouldn't be reported as a broken link. For this bug report, I guessed the component and the version; the version is actually 4.81.