I tightened up the 404 redirection on the templates of an ExpressionEngine site recently and when I next logged into Webmaster Tools for the site, it was reporting a large number of really weird 404 URLs, e.g. /template-group/page-title/1345982934000/ and in some cases /template-group/page-title/1346182913000/1347692092000/
When inspecting those links to find out what page they’ve been linked from, it shows /template-group/page-title/ so in other words from the correct page URL linking to the incorrect page URL, but when I check the front-end code of those pages, the dodgy links don’t exist.
So where do these weird links come from? Has anyone come across something similar before?
Those are timestamps, well apart from the trailing zeros. A quick Google turns up this result – are you using Disqus for comments? If so that’s probably the culprit.
Quote from a Google employee on the subject: