Details of the event with ID 19 of the source Microsoft-Windows-CertificationAuthority

Event Source:	Microsoft-Windows-CertificationAuthority
Event ID:	19 (0x13)
Event log:	Application
Event type:	Error
Symbolic Name:	MSG_E_REG_BAD_SUBJECT_TEMPLATE
Event text (English):	Active Directory Certificate Services did not start: The Subject Name Template string in the registry value HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CertSvc\Configuration\%1\SubjectTemplate is invalid. An example of a valid string is: CommonName OrganizationalUnit Organization Locality State Country
Event text (German):	Active Directory certificate services were not started: The applicant name template string in the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CertSvc\Configuration\%1\SubjectTemplate registry entry is invalid. An example of a valid entry is: CommonName OrganizationalUnit Organization Locality State Country

Parameter

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

• %1: CACommonName (win:UnicodeString)

Example events

Active Directory Certificate Services did not start: The Subject Name Template string in the registry value HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CertSvc\Configuration\ADCS Labor Issuing CA 1\SubjectTemplate is invalid. An example of a valid string is: CommonName OrganizationalUnit Organization Locality State Country

Description

Do you know TameMyCerts? TameMyCerts is an add-on for the Microsoft certification authority (Active Directory Certificate Services). It extends the function of the certification authority and enables the Application of regulationsto realize the secure automation of certificate issuance. TameMyCerts is unique in the Microsoft ecosystem, has already proven itself in countless companies around the world and is available under a free license. It can downloaded via GitHub and can be used free of charge. Professional maintenance is also offered.

Occurs when the "SubjectTemplate" registry value after change can no longer be read.

Safety assessment

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

Since the certification authority service no longer starts, availability is limited and the event is accordingly rated as critical.

Microsoft rating

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

Related links:

• Change the order of the Relative Distinguished Names (RDNs) in the subject of issued certificates.
• Overview of Windows events generated by the certification authority
• Overview of audit events generated by the Certification Authority

External sources

• Event ID 19 - AD CS Registry Settings (Microsoft)
• Securing Public Key Infrastructure (PKI) (Microsoft)