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NAP_S_CERT_ALREADY_PRESENT
NAP certificate is already present in the certificate store
NAP_S_CERT_ALREADY_PRESENT is HRESULT 2555917 (0x0027000D) from winerror.h. The documented description is “A certificate is already present in the cert store.” In the Windows platform service that returned an informational HRESULT, the value reports a nonfailure state that must not be collapsed into plain S_OK.
The application should branch on this result before a generic success path consumes the details.
Where the status is encountered
- Certificate provisioning, app activation, performance data collection, NDIS, or troubleshooting; capture the exact API, object, and phase because the same numeric success severity does not define the state by itself.
- System management code that must preserve a nonfailure result;
- Automation that would otherwise collapse the HRESULT to a Boolean;
What must be true before accepting it
Verify that the existing certificate matches the intended identity, issuer, purpose, and validity requirements. The caller should reject a path where outputs and state do not match the recorded condition.
Correct handling and recovery
Reuse the certificate only after validating its thumbprint and properties. Replace it through certificate-management policy when stale or mismatched.
Do not use an unchanged tight retry loop; it can duplicate effects or conceal a terminal state.
Difference from nearby results
This is idempotent presence, not proof that any certificate with the same subject is suitable.
Practical scenario
A health agent provisions its certificate and finds the expected thumbprint already installed. It verifies EKU and expiry and skips duplicate import.
References
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