I'm having the same issue: on my Windows 7 64bit with VPN Client 5.0.07.0290 the VPN comes up, but no data is going over the connection. Also I have no encrypted/decrypted packets, but all of them are discarded. Did you find the solution?
As the VPN Client on Windows 7 does not support WWAN devices
The current releases of VPN client software use an NDIS (Network Driver Interface Specification) intermediate driver that is based on NDIS 5.0 (specifications developed for Windows Vista and XP).
However, the native Windows 7 Mobile Broadband and Some Wireless WWAN miniport drivers are based on NDIS 6.2 specifications. VPN client applications using intermediate drivers based on NDIS 5.x specifications have compatibility issues with drivers compliant with Windows 7 Mobile Broadband.
Some vendors for wireless cards provides WWAN miniport drivers for Windows 7 that are Windows 7 logo certified and based on NDIS 6.2 (specifications for WWAN interfaces that can be supported natively in Windows 7).
The Cisco VPN client along with some other third party clients has compatibility issues with NDIS 6.2 WWAN miniport drivers:
The Cisco VPN client release notes state “The VPN Client on Windows 7 does not support WWAN devices (also called wireless data cards)”:
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...
[toc:faq]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 and UDP are I...