Details of the event with ID 12 of the source Microsoft-Windows-EnrollmentPolicyWebService

Event Source:Microsoft-Windows-EnrollmentPolicyWebService
Event ID:12 (0xC)
Event log:Microsoft-Windows-EnrollmentPolicyWebService/Admin
Event type:Error
Event text (English):The certification authority (CA) "%1" cannot be sent as part of the policy response. Confirm that this CA is running and that at least one Certificate Enrollment Web Service is configured to use this CA. %2
Event text (German):The certificate authority "%1" cannot be sent as part of the policy response. Ensure that the certificate authority is running and at least one certificate enrollment web service has been configured to use the certificate authority. %2


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

  • %1: CA (win:UnicodeString)
  • %2: Error (win:Int32)

The Certificate Enrollment Web Services (Certificate Enrollment Policy Web Service, CEP, and Certificate Enrollment Web Service, CES) enable the automatic request and renewal of certificates from a certification authority via a Web-based interface. This eliminates the need to contact the certification authority directly via Remote Procedure Call (RPC). For a more detailed description, see the article "Certificate request basics via Certificate Enrollment Web Services (CEP, CES)„.


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 and is available under a free license. It can downloaded via GitHub and can be used free of charge.

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

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