Why iptables sporadically drops initial connections requests?

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Issue

Packets opening connections are randomly being dropped with icmp-host-prohibited. Established connections do not appear to have connection issues. A restart of the iptables service usually clears up the problem for awhile (1 day? 2 days?) but it keeps coming back.

Environment

Red Hat Enterprise Linux Server release 5.7 (Tikanga)
Kernel: 2.6.18-274.7.1.el5 #1 SMP x86_64
iptables

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