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Consider the following scenario. You have a Windows Server 2003-based domain controller that hosts the certification authority (CA). Additionally, you enable automatic enrollment of certificates in the domain. In this scenario, the Windows Server 2003-based domain controller may request multiple certificates every 8 hours.
Additionally, an event that resembles the following may be logged in the Application log:
Event Type: Information Event Source: AutoEnrollment Event Category: None Event ID: 19 Date: Date Time: Time User: N/A Computer: Computer Description: Automatic certificate enrollment for local system successfully received one Directory Email Replication certificate from certificate authority Issuing CA1 on Computer. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
This problem occurs because you do not delete the previous certificate template correctly. Therefore, the previous certificate template still exists in the CA when you install the new certificate template. You cannot have duplicate certificate templates that have the same name. The duplicate certificate templates must have different names.
To resolve this problem, follow these steps:
Click Start, point to Administrative Tools, and then click Certification Authority.
Right-click Certificate Template, and then click Manage.
The certificate store opens, and you may see duplicate certificate templates that have the same name. For example, you may see the following records: