I've been seeing the following types of entries in /var/log/apache2/error.log
, at a rate of 10 entries per second:
[Tue Oct 09 05:53:11 2012] [error] [client XXX.XXX.XXX.XXX] script '/usr/local/ispconfig/interface/web/login_up.php3' not found or unable to stat
What might the user-agent be doing (or attempting to do) that would cause such a message to be logged?
In particular, I'm curious as to why the logged message references a file-system path, as opposed to a URL. This seems to indicate that the user-agent is targeting a specific PHP script that attempts to load a different PHP script from the file-system.