About two weeks ago, we reported that Google Webmaster Tools had 404 reporting errors. Well, after about two weeks, the 404, page not found, reports in Webmaster Tools is now accurate.
I logged in myself and saw that Google was only reporting pages that indeed give a 404 status response code.
JohnMu, a Googler, replied to the Google Groups thread last night at 7pm, to notify us that it has been resolved.
It looks like this issue should be cleared up by now. If you continue to spot incorrect 404 errors in your Webmaster Tools (with a recent date), it would be great if you could post the details here.
Thanks for your patience!
Why is this report so important? Well, it people try to spam your site, and you get hacked, the error reports might be a clue on what is going on. In fact, I found this URL in my 404 pages, seroundtable.com/archives/Floridasexualpredator.com, yes it 404s, but I wonder what is up with that.
So now it would be a good time to go into Google Webmaster Tools and browse through your crawl error reports and internal pages.
Forum discussion continued at Google Groups.