The anti-replay service is not available for manually established SA's (that is true for the PIX atleast). The fact that the service is enabled despite that, possibly indicates IOS corruption. I feel that reloading the OS might work. But for that I really don't see another way out since there seems to be no provision for disabling the anti-replay service.
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...
[toc:faq]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 and UDP are I...