| Event Source: | Microsoft-Windows-NetworkDeviceEnrollmentService |
| Event ID: | 18 (0x12) |
| Event log: | Application |
| Event type: | Error |
| Symbolic Name: | EVENT_MSCEP_FAIL_TO_DECRYPT_INNER |
| Event text (English): | The Network Device Enrollment Service cannot decrypt the client's PKCS7 message (%1). %2 |
| Event text (German): | The client's PKCS7 message (%1) cannot be decrypted by the network device registration service. %2 |
Parameter
The parameters contained in the event text are filled with the following fields:
- %1: ErrorCode (win:UnicodeString)
- %2: ErrorMessage (win:UnicodeString)
The Network Device Enrollment Service (NDES) provides a way for devices that do not have an identifier in Active Directory (for example, network devices such as routers, switches, printers, thin clients, or smartphones and tablets) to request certificates from a certification authority. For a more detailed description, see the article "Network Device Enrollment Service (NDES) Basics„.
Example events
The Network Device Enrollment Service cannot decrypt the client's PKCS7 message (0x80070005).
The Network Device Enrollment Service cannot decrypt the client's PKCS7 message (0x80090020). An internal error occurred.
The Network Device Enrollment Service cannot decrypt the client's PKCS7 message (0x80090008). Invalid algorithm specified.
The Network Device Enrollment Service cannot decrypt the client's PKCS7 message (0x80090011). Object was not found.
The Network Device Enrollment Service cannot decrypt the client's PKCS7 message (0x80090005). Bad Data.
Description
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Occurs when the PKCS#7 message sent by the SCEP client to the network device registration service cannot be decrypted.
Error code "Bad Data" (0x80090005)
This may be the case, for example, if the Registration Authority Certificates have been renewed recently and messages were still encrypted with the key of the previous CEP Encryption certificate. This can occur again if, for example, the certificate enrollment was done with the SSCEP Client was performed and the Registration Authority certificates were not retrieved again.
See also article "Requesting certificates via Network Device Enrollment Service (NDES) fails with HTTP error code 500„.
Error codes „An internal error occurred“ (0x80090020) and „Invalid algorithm specified“ (0x80090008)
This can occur if the NDES server (or its CEP encryption certificate) does not support the encryption algorithm used by the client.
This can occur in particular when the client (e.g., BlackBerry Enterprise Mobility Suite) enforces the Advanced Encryption Standard (AES) algorithm, and the NDES server uses certificates with a hardware security module whose Cryptographic Service Provider no one understands AES.
Error code „Object was not found“ (0x80090011)
This error may occur if the NDES server uses a hardware security module (HSM) and communication with it is disrupted.
Safety assessment
The security assessment is based on the three dimensions of confidentiality, integrity and availability.
Availability may be affected, so this event should be under consideration.
Related links:
- Overview of Windows events generated by the Network Device Enrollment Service (NDES).
- Basics: Cryptographic Service Provider (CSP) and Key Storage Provider (KSP)
- Cryptographic Hardening of SCEP Transactions for the Network Device Enrollment Service (NDES)
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