The issue has been fixed. For those of you that are experiencing the same issue...
Make sure that your ASA does not have a NAT'd IP to the appliance outside interface, because this will prevent you from using port 443 for services usch as WebVPN and therefore Anyconnect will stop working.
My recommendation is to use an IP address from your available ISP pool to NAT outside but not directly using the outside "interface" because it will stop all communications from the internet to the ASA Outside interface servicing WebVPN or any other services that depent on it.
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...