I am not clear what you are telling us when you say that the Windows image "disappearing from CLI". Can you help us understand better?
Is your ASA perhaps part of an active/standby HA pair? Is it possible that the disappearance coincides with a failover event? If so please check and verify that the Windows image is in flash on BOTH of the ASAs.
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...