we discovered same problem on L2L VPN between two ASA 8.0.4 - %ASA-4-402120: IPSEC: Received an ESP packet...that failed authentication. We have not only log/error decryption issue but there is problem with transmiting a bigger data loads. What can be behind this "faild authentication"? Any infrastructure problem? Both ASA's are physically connected on some switch. Any ideas?
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...