Thanks for the reply. I am looking at the ICF firewall. Do you know what's the pre-configured check/rule name for it.
Anyway, after googled on the internet, I found the ICF firewall was controlled by the following registry setting. I manually created a check/rule. It seems working. Now I will further find out what's the registry related to the vista windows firewall.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...