How to restrict Cisco AnyConnect VPN connections to domain computers

I have a Cisco ASA 5515 failover pair and a Windows 2008 R2 server that has Network Policy Server installed and uses RADIUS to authenticate Cisco AnyConnect VPN clients.

I am looking for options on how to limit Cisco AnyConnect VPN connections to company laptops.

I considered this - http://www.petenetlive.com/KB/Article/0000335.htm - but understand that Cisco ASA failover pairs cannot be used as local certificate authorities.

My RADIUS server uses the logic of if a user is a member of an AD security group "VPN Access" - they can authenticate.  Is it possible to incorporate something similar for computers that are part of the AD domain?  Are there any other options I can consider?
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djhathAsked:
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Pete LongTechnical ConsultantCommented:
Thanks for the free site advertising :)

Do a search on the site you will find..
http://www.petenetlive.com/KB/Article/0001030.htm

Spin up a Microsoft PKI server and secure the VPN with Computer certs, or User Certs (or both!)  full instructions on that helpful and informative technical website ;)

Pete
djhathAuthor Commented:
Coming back to this a year later (sorry), I used the Host Scan module in the ASA to search for a specific registry value consistent with membership to the AD domain. If the VPN client was installed on a non-domain computer, the VPN connection would terminate because the non-domain computer didn't contain the appropriate registry value.

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djhathAuthor Commented:
The solution I provided was the solution used to address the issue.
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