Details of the event with ID 48 of the source Microsoft-Windows-CertificationAuthority

Event Source:	Microsoft-Windows-CertificationAuthority
Event ID:	48 (0x30)
Event log:	Application
Event type:	Warning
Symbolic Name:	MSG_E_CA_CERT_REVOCATION_OFFLINE
Event text (English):	Revocation status for a certificate in the chain for CA certificate %3 for %1 could not be verified because a server is currently unavailable. %2.
Event text (German):	The revocation status of a certificate in the %3 certificate authority chain for %1 could not be verified because the server is currently unavailable. %2.

Parameter

The parameters contained in the event text are filled with the following fields:

• %1: CACommonName (win:UnicodeString)
• %2: ErrorCode (win:UnicodeString)
• %3: CACertIdentifier (win:UnicodeString)

Example events

Revocation status for a certificate in the chain for CA certificate 2 for ADCS Labor Issuing CA 3 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 CRYPT_E_REVOCATION_OFFLINE).

Description

The event occurs when the revocation status for one of the previous (not the current) certificate authority certificates cannot be checked. This can have the following causes:

• The revocation list in question has expired, see article "What impact does the expiry of the revocation list of one of the higher-level Certification Authorities have on the Certification Authority?„
• The revocation list in question cannot be downloaded, see article "What impact does incorrect revocation information of a certification authority certificate have on the certification authority?„

It should be noted that the CAPI has the same error code CRYPT_E_REVOCATION_OFFLINE for an expired blacklist and for an unreachable blacklist.

The Certification Authority service will start normally.

If the current certification authority certificate is affected, then the event with ID 100 is generated and the certification authority service does not start. See article "The certification authority service does not start and throws the error message "The revocation function was unable to check revocation because the revocation server was offline. 0x80092013 (-2146885613 CRYPT_E_REVOCATION_OFFLINE)".„.

Safety assessment

The security assessment is based on the three dimensions of confidentiality, integrity and availability.

Since this event only occurs when the current certificate authority certificate is not affected, there should be no impact on availability.

Microsoft rating

Microsoft evaluates this event in the Securing Public Key Infrastructure (PKI) Whitepaper with a severity score of "Low".

Related links:

• Overview of Windows events generated by the certification authority
• Overview of audit events generated by the Certification Authority

External sources

• Event ID 48 - AD CS Certification Authority Certificate and Chain Validation (Microsoft)
• Securing Public Key Infrastructure (PKI) (Microsoft)