Do you have an example? Are you using the wizard to create the exception? Is it in test mode? Are you using group exceptions? Have you tried copying the rule from the group exception to the same policy? Have you tried disabling the rule to see if another rule is superceding it?
Try isolating the two rules in a single policy to see what is happening without any interference from other policies.
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...