Assume the following scenario:
- You try to request a certificate via a Certificate Enrollment Web Service (CEP) from an Active Directory-integrated certification authority (Enterprise Certification Authority).
- The operation fails with the following error message:
Certificate Request Processor: A connection with the server could not be established 0x80072efd (WinHttp: 12029 ERROR_WINHTTP_CANNOT_CONNECT)
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)„.
Possible causes can be:
- The Internet Informaton Services (IIS) service is not running on the CES.
- The connection is blocked by a firewall. See also article "Required firewall rules for the Certificate Enrollment Web Service (CES)„.
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