Microsoft Certificate Services Won’t Start: getting error

Problem:  When trying to start Microsoft Certificate Services on my Server 2003 box, I get the following error:

A required certificate is not within its validity period when verifying against the current system clock or the timestamp in the signed file. 0x800b0101 (-2146762495).

Solution.  The Root CA for the server expired and needed to be renewed.  Within the Certification Authority MMC, I right clicked on my Cert Auth and selected “All Tasks” and then “Renew CA Certificate.”  Followed the steps and was able to start the Cert Services again..

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