I had about 10 windows VPN clients setup on my PC (Windows XP SP3). I recently installed Cisco VPN client 4.0.4(B). I got the Cisco VPN client working and can connect to my customer that requiers the Cisco VPN. The problem is that all of the Windows VPN clients stopped working. They respond with a 721 error - the remote computer did not respond. They worked fine befoe the Cisco VPN was installed.
I have this problem too.