The Cisco IPSEC VPN client is not officially supported on Windows 8 or 8.1. You can make it work following these steps.
1. Make sure the client is uninstalled.
2. Download the Citrix Deterministic network adapter from the following link.
ftp://files.citrix.com/dneupdate64.msi
3. Install the DNE and then the Cisco VPN client.
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