cisco vpn error 51
I have recently purchased a new MacBook Pro, which came with lion installed. I changed it back to snow leopard. I then installed a vpn client. I continually get an error 51 when I try to use it. The description is as follows: 'unable to communicate with the VPN subsystem. Please make sure that you have at least one network interface that is currently active and has an IP address and start this application again.' I have made sure that I have an active address on a network which is not the vpn I am attepting to connect to.
Is there something I have forgotten in setting up my wireless or eithernet connection. Both are active and fuctioning properly. Any HELP would be appreciated.
Thank you.
MacBook Pro, Mac OS X (10.6.8)