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Linux Iptables ip_conntrack: table full, dropping packet error and solution

My Red hat Enterprise Linux 5 server reporting the following message in /var/log/messages (syslog):

ip_conntrack: table full, dropping packet.

How do I fix this error?
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How To: Disable Firewall on RHEL / CentOS / RedHat Linux

I don't want firewall because I only run one http (port 80) public service. How do I turn off or disable firewall permanently under RHEL / Fedora Linux / Red Hat Enterprise Linux and CentOS Linux?
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