Hi, I am on a dedicated, Code PHP and MySQL
but my mod_rewrite is poor "understatement"!

How could I block those requests, daily knocking at the door?

Requests with error response codes
404 Not Found
//phpMyAdmin/: 5 Time(s)
//phpmyadmin/: 5 Time(s)
/robots.txt: 1 Time(s)
http://proxyjudge3.proxyfire.net/fastenv: 1 Time(s)
http://zerg.helllabs.net/cgi-bin/textenv.pl: 1 Time(s)

Thanks.