By default it should be enabled. Firewalls or Antivirus software might block adapter from being enabled. Try disabling them . If that doesnt create a shortcut for the icon on the desktop and enable it as a temporary workaround. You can also updating the VPN client software.
There is not a newer version of VPN Client than this, seems to coorelate to when I close my lid and laptop goes into sleep and then awakes later. Sometimes I have to reboot for the Virtual Adapter to stay enabled. I'll enable it and hit F5 and it will be back at Disabled. Most of the time it stays Enabled. No Firewalls and I don't think AV would Disable a Virtual Adapter, my wireless or ethernet never Disable. Annoying caveat!
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...