Details of the event with ID 9 of the source Microsoft-Windows-CertificationAuthority

Event Source:	Microsoft-Windows-CertificationAuthority
Event ID:	9 (0x9)
Event log:	Application
Event type:	Error
Symbolic Name:	MSG_NO_POLICY
Event text (English):	The Active Directory Certificate Services did not start: Unable to load an external policy module.
Event text (German):	Active Directory Certificate Services failed to start: No external policy module could be loaded.

Example events

The Active Directory Certificate Services did not start: Unable to load an external policy module.

Description

Occurs when the certificate authority cannot load a policy module. Occurs in conjunction with the Event no. 44 on.

It may occur due to the cause when no connection to the Active Directory can be established when the Certificate Authority service is started. In this case, the events no. 91 and 94 logged.

Safety assessment

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

Since the certification authority service cannot start, the certification authority is not available. In addition to not being able to apply for certificates, this will also mean that no new revocation lists will be issued in the long term and thus services that depend on the PKI will fail.

It is therefore essential to raise the alarm. Also should Emergency measures be initiated to maintain the blacklist operation.

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
• Perform emergency signing of certificate revocation lists

External sources

• Event ID 9 - AD CS Policy Module Processing (Microsoft)
• Securing Public Key Infrastructure (PKI) (Microsoft)