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Certificate enrollment issue

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Hello,

I am pretty new to AD. I have two Windows 2008 R2 servers running as domain controller and DNS server. There is also one more Windows 2008 R2 machine which is only certificate authority. The first server I installed as DC (and DNS) displays following errors below every 8 hours in event viewer.

"Event ID: 6, Source: CertificateServicesClient-AutoEnrollment

Automatic certificate enrollment for local system failed (0x800706ba). The RPC server is unavailable."

"Event ID: 13, Source: CertificateServicesClient-CertEnroll

Certificate enrollment for Local system failed to enroll for a DomainController certificate with request ID N/A from CertificateAuthority.mydomain.net\mydomain-CertificateAuthority-CA (The RPC server is unavailable 0x800706ba (WIN32: 1722))."

However, the second DC is running without displaying any error, seems there is no problem on certificate enrollment.

The first DC with issue also displays following error message:

"Event ID: 10009, Source: DistributedCOM

DCOM was unable to communicate with the computer CertificateAuthority.mydomain.net using any of the configured protocols."

This implies me that first DC cannot communicate with the CA, but I can successfully Ping CA from that DC. Even thought, I enabled "COM+ Network Access (DCOM-In) Windows firewall rule (although which is not enabled on the second DC), but still receiving DCOM error (10009) at the same time with the other two (6 and 13) every 8 hours.

Can you please let me know if I miss something?

I'm also new to this forum, so if I have to use another part of the forum please let me know.

Thank you very much,

Best regards,

MarufBey


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