RDP connection to domain server from non-domain client prompts "A revocation check could not be performed"

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http://serverfault.com – I've got about 30 Windows 2008 R2 servers as members of a domain, and am attempting to configure the certificates part correctly for remote desktop access to those servers. The catch is that the clients that need to connect to these servers are not on the domain. The clients are on the same internal network as all the domain computers. So far, I have done the following: Created the CA Configured a certificate template for Remote Desktop Authentication Configured the Default GPO to enable auto-enrollment and to get the remote desktop servers to enroll a certificate from the RDP cert templat (HowTos)