[CentOS] Interpreting logwatch

Every few days I see in the logwatch on my Centos-5.5 web-server what seems like a rather feeble break-in attempt. Eg today I see --------------------------- 403 Forbidden /phpMyAdmin/scripts/setup.php: 2 Time(s) /phpmyadmin/scripts/setup.php: 2 Time(s) 404 Not Found /PMA2005/scripts/setup.php: 1 Time(s) /TRAD_files/datestamp.js: 1 Time(s) ... --------------------------- followed by dozens of similar lines.

As far as I can see, the IP of the person making the attempt (if there was an attempt) is not given.

I'm not at all sure what if anything I should do about this.

In fact, I'm not clear how one should deal with logwatch entries in general. Is there any document giving advice on this?