For the past number of months Google Webmaster Tools has been showing increasing numbers of Not Found 404 errors in the crawl errors. It is currently at over 2200 errors. It was at 1200 last week.
The 404's are for URL's on my site that have never existed and the page that they were supposedly linked from is no longer available.
The strange bit is that the URL is made up from valid parts of my site but in a combined incorrect order. Let me explain,
One of the invalid URL's looks like this;
One part of the URL is correct
and the other part is also correct
Google seems to be detecting parts of each url and combining them.
I have no idea how this is being created and I thought that it was just a google glitch. I have requested help on the google webmaster forum several times now to no avail. I would appreciate anyones help with this.
It is worth mentioning that there is quite a detailed htaccess file for the site although I can not see where within the rewrite rules that this could be caused.
[edited by: goodroi at 12:34 pm (utc) on Jun 27, 2011]
[edit reason] Fixed URLs [/edit]