The creation of a certificate enrollment policy for the Certificate Enrollment Policy Web Service (CEP) fails with the error message "This ID conflicts with an existing ID."

Assume the following scenario:

• A Certificate Enrollment Policy Web Service (CEP) is implemented in the network.
• An enrollment policy is configured.
• Testing the connection fails with the following error message:

The URI entered above has ID: "{{GUID}}". This ID conflicts with an existing ID.

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)„.

Cause

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.

This error occurs when a certificate enrollment policy already exists with the same GUID. Often this occurs because the default Active Directory enrollment policy is still configured. Its GUID is identical to that of the Active Directory forest.

Related links:

• Performing a functional test for the Certificate Enrollment Policy Web Service (CEP)