Is this entry in error_log a security issue? – File does not exist: /usr/local/apache/htdocs/files

Dan asked:

Is it strange to see entries such as the one below in an error_log?

[Sat Dec 08 18:10:16 2012] [error] [client 66.249.76.---] File does not exist: /usr/local/apache/htdocs/files

My understanding was that File does not exist: basically means a 404?

Why would an unknown ip try to be accesing /usr/local/apache/htdocs/files ?

My answer:

That’s a Google IP address, and they’re probably trying to access it because something was there at some point in the past. Your web server sent them a 404, since there is nothing there now.

It is kind of unusual that you didn’t provide redirects when you reorganized your site; typically this is done for search engine optimization purposes.

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