Multiple Google webmaster tools wordpress errors

[Gemini23]

Can anyone advise...

In my Google Webmaster Tools I am getting a lot of page not found errors... this within the past few weeks and the following within the past few days.

for example.. PAGE NOT FOUND
xyz.com/blog/index.php/date/2011/02/page/9/

with the error orginating from

xyz.com/blog/index.php/date/2011/02/page/10/

BUT the latter of the two pages doesn't exist. (and hasn't been removed recently)

I am also seeing error messages with the "/feed" at the end of the post url and I cannot see why this is happening.

I am getting dozens of these error messages.

Thanks for any help or advice..

[not2easy]

In GWT when it shows you 404 errors, it will show you what pages they were referenced from. Recently I have found them showing 404s referenced from 2008 sitemaps, 2010 sitemaps, even from other sites, etc. as if every post or page ever created and referenced in a sitemap is supposed to exist forever in that same location. I realize that is the point of "permalinks" but the reality is that old stuff gets removed. I see the same kinds of 404's on static sites so I don't think it is WP specific.

I am seeing more weird 404's than ever, sometimes the URL is obviously search results, I have quit pulling my hair out over GWT errors that make no sense.