The reason you can't remove that line is you have to take NAT off the interfaces and do a clear ip nat translation table command before you can remove it. You may want to open a case with Cisco on the issue of pinging the 18.104.22.168 address. The NAT and access lists look okay - this might be a crypto issue.
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...