NPS unable to authenticate clients when CR Server is Down.

Hi,

We came across an issue where one of our CRL server was down and NPS was unable to authenticate clients given the

Error Code: 259
Reason:The revocation function was unable to check revocation because the revocation server was offline

Then, I read in this link http://technet.microsoft.com/en-us/library/cc770602(v=ws.10).aspx that says (below)

"By default, the NPS server uses the CRL distribution points in the certificates.However, it is also possible to store a local copy of the CRL on the NPS server."

I would like to know, how do i verify this settings or where do i configure this settings? I would like to ensure my NPS will still be able to authenticate clients even when the CRL servers are down. Am i right to say that when these settings are set, even when CR is down, my NPS will still be able to authenticate clients?

Thanks in advance.

Rgds
HLJ

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hanglj