A little more information would have been nice. All the same, if you are using Win98, bug CSCeb74698 is probably the cause of your problem. Also, I really haven't heard of too many problems with the VPN Client 4.0.2. This looks like a configuration problem. It would be a good idea to make sure you have followed the upgrade procedure properly.
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...