Any script kiddie may stop ftp service on any RedHat-based box using diewa170.exe from http://neworder.box.sk/showme.php3?id=1465. inetd stop service with message: Feb 27 12:48:37 myhost inetd[2548]: ftp/tcp server failing (looping), service terminated for 10 minutes. After 10 minutes, the above mentioned script kiddie may use his tool again and again, so ftp service will not be available for long time until admin discover it and install firewall rule. Possible solution may be using xinetd with per_source=5 instead of inetd, as in TurboLinux. Good reason for bugtraq discussion and errata update, isn't it?
xinted is in Red Hat 7.0, that should help dealing with DoS attacks.