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MQ_ERROR_CANNOT_SIGN_DATA_EX
MQ_ERROR_CANNOT_SIGN_DATA_EX: MSMQ could not create the signature needed for an authenticated outgoing message
MQ_ERROR_CANNOT_SIGN_DATA_EX (0xC00E0080) identifies a specific boundary: MSMQ could not create the signature needed for an authenticated outgoing message. Keep it separate from neighboring errors that may occur in the same product but represent a different lookup, state, trust, or transport decision.
Evidence to capture
Record message ID, queue, sender certificate/private-key identity, cryptographic provider/algorithm, and the first signing error. This is a sender-side signing failure before the authenticated message can be sent.
Corrective test
Verify private-key access and supported signing configuration for that sender, then resend one controlled message and confirm a signature is produced. Preserve the original identifiers while testing; if another HRESULT appears after this boundary is fixed, treat that value as the next-stage result.
Technical references
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