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We are running wu-ftpd-2.6.0-1 on our ftp-Server. If we get a lot of simultanious requests, inetd stop listening to the ftp service( no "LISTEN" entry for ftp in the output of netstat -a command). About 10 mintutes later inetd starts again listening to ftp service.
Add a max. rate to the ftp entry in /etc/inetd.conf: ftp stream tcp nowait.NNN root /usr/sbin/tcpd in.ftpd -l -a where NNN is something like 100. See "man inetd.conf" for details.