This is a know problem with domains over the WAN link. There are couple of timeouts here, one is on the ACS timeout, and the other one is the AP timeout. I would suggest you to open up a TAC case and so that TAC can follow up with the developers to see if there is any viable solutions/work around on this issue.
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...