apache being bombarded

From: datasoftvsp@sify.com
Date: 03/06/02

From: <datasoftvsp@sify.com>
To: "Security-Basics List" <security-basics@securityfocus.com>
Date: Wed, 6 Mar 2002 18:59:47 +0530

Hi gurus
one of my apache servers is being bombarded by some IPs (in different
ranges) trying for a root.exe or cmd.exe. etc.
luckily im on redhat 71. linux.
but the tries frequency is every second from some ip or another.
im running portsentry but portesntry does not log port 80
how do i block them from permanently accessing my server.
BTW ive put that IPs in my /etc/hosts.deny still no joy.

durga prasad