I think this will be even a bigger issue now, that Windows 7 is coming out soon. The Cisco Systems company doesn't want to support 64bit operating systems and the old Cisco VPN client, from what I've read it seems that they are pushing their new An圜onnect VPN client, which apparently doesn't support IPsec, companies would have to upgrade a lot of stuff to use VPN with this new software (information gathered from the internet).
But apparently Cisco VPN client does not support 64 bit operating systems! I used Cisco VPN client to connect to my university intranet, which uses IPsec technology. Many companies or institutions use some sort of VPN (Virtual Private Networking) solution to protect their resources and stuff. Update 10/Sept/2009 (a free solution) :A free VPN client worked successfully for this IPSec connection type ! Its overview is here ! Please don't refer to this website as your configuration guide when contacting NCP-e support, this is not in any way a technical or support resource, it's more an example what the software is like when working with it. All other situations are not included in this guide. For which you need an IPSec group ID, IPSec group password and your Xauth username and password, as this is the only IPSec connection type I have access to.
#NCP SECURE ENTRY CLIENT DROPPING CONNECTION HOW TO#
Also, this is only a guide how to set-up a particular connection, which I think is very common with universities and workplaces, that allows to access particular resources.
Update 15/Dec/2009: today I was contacted by NCP-E saying that "people blindly follow the advice on this website" and that it's "frustrating for them to correct mistakes that this thread generates, which frustrates both them and their customers", so before you follow the guide, I want to clarify some points: this thread is a bit out-of-date already, a newer client has been released.