What does HRESULT 0xC00E0063 (MQ_ERROR_PROV_NAME_BUFFER_TOO_SMALL) mean?

MQ_ERROR_PROV_NAME_BUFFER_TOO_SMALL

Operational meaning

MQ_ERROR_PROV_NAME_BUFFER_TOO_SMALL means cryptographic provider name buffer. The returned provider name is textual metadata used to interpret authentication material.

A receive API may preserve the message when a property buffer is insufficient, but code must verify the documented behavior for the specific property and action. When diagnosing this result, A destructive retry without that check risks loss or duplication.

Variable-size MSMQ properties normally have a companion length property. The length returned after failure is evidence for allocation, not permission to process a truncated certificate, label, signature, or key.

Where the condition occurs

This is not automatically an out-of-memory condition. It describes caller-provided capacity for a particular returned property and often has a deterministic resize path. The code-specific boundary is cryptographic provider name buffer.

Evidence to preserve

• Whether the operation consumed or retained the message.
• The property-specific length field returned by the same call.
• Declared capacity, returned required length, and element type.

Handling and recovery

Resize the character buffer and keep provider type alongside the name.

Nearby failures

The condition is not evidence of low system memory. It describes the capacity and representation of one caller-owned output area. Code-specific condition: cryptographic provider name buffer.

Worked example

A com/native interoperability layer encounters it. It uses the returned required length, keeps the operation non-destructive, and retries with correctly typed storage.

References

• Microsoft: MQReceiveMessageByLookupId
• Microsoft: Message Queuing error and information codes
• Microsoft: MSMQ message properties
• Microsoft: MQReceiveMessage