Cisco VPN client: error 56, service starts and then stops when you try to start it manually

This is a repost of a post from an old blog, made on January 3, 2012, that used to be on:

http://adminramble.com/cisco-vpn-client-error-56-service-starts-and-then-stops/

Original post:

I was installing Cisco VPN client on a laptop today and after the installation whenever I tried to run it I got

Error 56: The Cisco Systems, Inc. VPN Service has not been started. Please start this service and try again.

So naturally I went to Administrative tools > Services and tried to start Cisco VPN service, but whenever i tried I got:

service on local computer started and stopped.some services stop automatically if not in use by other services or programs.

I tried reinstalling Cisco VPN client but I still got the same error. The solution that worked for me was to turn off Internet Connection Sharing (ICS)

Go to Administrative Tools > Services > right click Internet Connection Sharing and go to Properties > On General tab stop the service and change startup type from Automatic to Manual

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