Description of problem:
ntpd: Opening firewall for input from 66.187.233.4 port 123[  OK  ]
ntpd: Opening firewall for input from clock.redhat.com port
123/etc/init.d/ntpd:  line 169:  9481 Segmentation fault      iptables
-I $FWCHAIN -m udp -p udp -s $ server/32 --sport 123 -d 0/0 --dport
123 -j ACCEPT
                                                           [FAILED]
ntpd: Synchronizing with time server:                      [  OK  ]
Starting ntpd:                                             [  OK  ]


Version-Release number of selected component (if applicable):
# rpm -q ntp
ntp-4.2.0.a.20040616-1


How reproducible:
always


Steps to Reproduce:
1. service ntp start
2. 
3.
  
Actual results: Segfault.

Expected results: Not a segfault :-)

Additional info:

I noticed that system-config-securitylevel had the firewall enabled. 
Disabling the firewall causes ntp to load normally.