Sometimes we get some 404 errors in our WMT and
when we look at the "Linked from" tab we see that the problematic URL
is being linked in certain pages where if we do a quick check there is no
direct link to that file, not even inside of the Javascript code. So, where
might be the problem then? if your client's website is using flash, that may be
the origin of the problem.
One of our clients had a small flash gallery and
the SWF file was loading it contents from an XML file which contained the list
of images to be displayed. The SWF path was correct, the gallery was working
seamlessly and we were continuously getting and 404 in WMT for those XML files.
Obviously that XMLs were only linked inside the SWF files, and that was when we
realized that Google was trying to index the SWF contents and when doing that
it was crawling a wrong path for the XML files, and that was the reason why we
were getting 404 errors alerts in files we never linked inside pages
without a simple direct or visible link to them.
The solution, add the full path in the link to the XMLs files inside the SWF or
a slash at the beginning of the URL to avoid the creation of non-existent URLs.
I hope you find this small tip useful, but sometimes when you don't know where
the problem is or where to look for... it's a good idea to try other things
that might not have sense at all at the beginning.
