We see errors like this in the apache error log:
[Thu May 17 14:32:35 2012] [error] [client 192.168.1.1] File does not exist: /home/www-data/mywebsite.com/r/cache, referer: http://www.mywebsite.com/r/1010
It is strange because:
- There is no reference in the code/url about a folder/file "cache".
- The folder/file "cache" does not exist
- The client is randomly trying to access a "cache" folder everywhere on the website.
- It is always trying to access the folder/file "cache" following this pattern:
/level1/.../levelwhatever/filename (referer) /level1/.../levelwhatever/cache
We run a LAMP (Debian stable: PHP 5.3.3-7+squeeze9. We also use APC 3.1.3p1). We use Google Analytics and AdSense.
We do not know how to reproduce the problem.
Note: I replaced the user's IP in the code for privacy.