If you are running PIX OS version 6.X, bugs CSCdx89579 and CSCea82010 could be responsible. If they apply to you, you could opt for an upgrade of the OS for the first bug or avoid the sequence of events that trigger the crash as is the case with the second.
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...