Event ID - 27

Event Id27
SourceMicrosoft-Windows-CertificationAuthority
DescriptionActive Directory Certificate Services did not start: Hierarchical setup is incomplete. Use the request file in %1.req to obtain a certificate for this certification authority, and use the Certification Authority snap-in to install the new certificate and complete the installation.
Event InformationAccording to Microsoft :
Cause :
This event is logged when Active Directory Certificate Services did not start.
Resolution :
Complete installation by importing a newly issued CA certificate
A certification authority (CA) must have a valid CA certificate in order to function. If you do not already have a valid CA certificate, complete the installation by importing one.
Note:
To perform this procedure, you must have Manage CA permission, or you must have been delegated the appropriate authority.
To import a newly issued CA certificate and complete a CA installation:
1.On the computer hosting the CA, clickStart, point toAdministrative Tools, and then clickCertification Authority.
2.Right-click the name of the CA, point to All Tasks, and clickStart Service.
3.Follow the prompts to complete installation by importing the newly issued CA certificate.
Reference LinksEvent ID 27 from Source CertificationAuthority

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