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CRYPT_E_MSG_ERROR
The failure came from a CryptoAPI cryptographic-message operation. It is a wrapper-level status: the useful diagnosis is the API call, message format, and earlier error that led to it.
What to check
- Record whether the code came from decoding, signature verification, decryption, or message control; those operations have different prerequisites.
- Keep the original message bytes and their transport metadata so the failure can be reproduced without altering the payload.
- Inspect the first specific error produced while processing the message rather than treating this generic status as a certificate-trust failure.
Microsoft: CryptMsgOpenToDecode
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