event id 9 source security-kerberos

OS: Windows 7 Enterprise

Issue: I get the below error on 2 workstations when trying to login via smartcard.

Error: (event id 9 source security-kerberos) The client has failed to validate the Domain Controller certificate for snouembad8.tcsc.ussouthcom.mil. The following error was returned from the certificate validation process: The revocation function was unable to check revocation because the revocation server was offline.

I followed the instructions in: http://technet.microsoft.com/en-us/library/dd363885(v=ws.10).aspx

To request a new certificate:

1. Expand Certificates (Local computer),right-click Personal, and then clickRequest New Certificate.
2. Complete the appropriate information in the Certificate Enrollment Wizard for a domain controller certificate.
3. Close the Certificates snap-in.

and I get this additional error:

Logon Failure: The user has not been granted this type of logon request