If you are starring at the screen and see a messages like: “Unable to establish VPN” or “The VPN client agent was unable to create the interrocess communication depot” you may be in luck.
Assuming that you have checked the oblivious like, correct username/password or right server connection you may be a victim of “Internet Connection Sharing”.
I have been running Window Server 2008 R2 for some time and love it because of the power of Hyper-V with regards to managing my virtual environments. One thing that I have done is shared my Wireless Adapter with my virtual Adapter so I can get internet connectivity to my VMs while I am connected to WIFI.
Little that I knew that it would interfere with my ability to use Cisco VPN. I even un-installed and try to re-install the client to be greeted by more errors:
At the end all I had to do is to disable “Internet Connection Sharing” and Cisco VPN started to work.
I hope it will save you some time.