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Thanks to all who responded. I was finally able to resolve this problem by by changing zone protection for Untrust from SYN Cookies to Random Early Drop.
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Thanks @fhewiufhwefhwe but the problem we are facing is that when the TCP outage occurs our thousands of user who are scattered across the Internet world are not able to reach our websites or mail servers. We don't want the firewall to block the whole Internet. I should also point out if the subject is not clear that the problem is only with incoming TCP traffic. Outgoing traffic is not affected.
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At random times all TCP connections from the Internet are blocked (all ports and all IPs) for incoming traffic only. Websites, mail servers etc are not accessible from the Internet. UDP and ICMP are not affected. What could be causing this?
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