Cannot get Certificates working for VPN L2TP IPSec Server and Client

I have a remote Windows 2003 Server configured as a VPN server, through RRAS. It is also a Standalone Root CA and has IIS installed. It is not in a domain so AD is not installed.

I have VPN working through PPTP but needed to connect multiple clients from behind a NAT firewall, so am migrating to L2TP and IPSec. I have tested the system OK, using pre-shared keys but cannot get the certificate part to work.

On the client XP computer, Using web enrollment, I have installed client authorisation cert and IPSec Cert to the local machine store. Are these the right certs to install and what certs (if any) do I need to install on the VPN server?

On the client VPN connection properties, security tab, I have selected Advanced and configured the settings to use EAP "Smart Card or other Certificate", properties to use a certificate on this computer, simple certificate selection and de-selected validate server certificate (because I didn't understand the options...)

Hope this is enough info for someone to help?
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CrossMouseAuthor Commented:
I've now resolved this issue myself and the answer is:

Install an IPSec certificate for the local machine store on the VPN server

Install an IPSec certificate for the local machine store on the client PC

Export the issuing CA cert to a file on the client PC and then import it to the Trusted Root CA certificates folder. Note that other articles will say that there is a red cross next to the issuing CA on the client machine, before you have added it to the Trusted folder, but I did not find this to be the case.

To view installed certs, Start, Run, mmc Enter Add Certificates, computer account NOT local user.

Hope this may help someone else...
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