A. Microsoft provides the PKI Health Tool (PKView.exe) as part of the Windows 2003 Resource Kit Tools (http://www.microsoft.com/downloads/details.aspx?familyid=9d467a69-57ff-4ae7-96ee-b18c4790cffd&displaylang=en). PKView determines whether the Authority Information Access (AIA) and Certificate Revocation List (CRL) distribution point URLs are valid and reachable. The tool also determines whether the associated certificates are nearing expiration. To run PKIView, select Start, Run, and type pkiview.msc A Microsoft Management Console (MMC) instance will initiate. Select a CA to display the status of each CRL and AIA location, as Figure 1 shows. If you have more than one CA in your hierarchy, select each CA in turn to check the status of the whole hierarchy. The status field should display OK for all entries. If the publication point isn't correctly configured or the CA certificate or CRL isn't copied correctly to the publication point (missing), the status will show "Unable to Download." If the CA certificate or CRL is nearing expiration, the status column will show "Expiring."