Event ID - 48

Event Id48
SourceCertSvc
Description Revocation status for a certificate in the chain for CA certificate 0 for Enterprise-Sub could not be verified because a server is currently unavailable. The revocation function was unable to check revocation because the revocation server was offline. 0x80092013 (-2146885613).
Event InformationWhen you restart your computer after you upgrade to Windows 2000 Service Pack 4 (SP4), the Certificate Services service (CertSvc) does not start. Additionally, one or more of the events like 100, 7024 from the above source may appear in the application log of Event Viewer. CAUSE This issue occurs because a valid Certificate Revocation List (CRL) for one or more of the intermediate certification authority (CA) certificates could not be found. This issue may occur if the CRL is not available to the certificate server, or if the CRL has expired. WORKAROUND To work around this issue, use one of the following methods, as appropriate to your situation. Method 1: Make Sure That a Valid CRL Is Available Take steps to make sure that a valid CRL is available. This is the optimal workaround for this issue. Fore more resolution steps click on the link given below to microsoft article.
Reference LinksCertificate Services Does Not Start After You Upgrade to Windows 2000 Service Pack 4

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