Could be a few reasons why it is failing. Firstly what devices are you using for the VPN endpoints? I have not seen any ISAKMP policies configured here either. These are required to match for the first part of the VPN establishment.
What do the outputs of "show crypto isakmp sa" and "show crypto ipsec sa" show you?
Are you able to post the configs for both side of the tunnel (minus any sensitive information of course)
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...