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MQ_ERROR_SENDER_CERT_BUFFER_TOO_SMALL
What this result actually narrows down
MQ_ERROR_SENDER_CERT_BUFFER_TOO_SMALL belongs to the Message Queuing HRESULT facility, but its useful meaning is narrower than a generic messaging failure. It applies to sender-certificate retrieval buffer. The certificate property has a variable byte length and must be paired with its reported size.
Buffer capacity should be logged in bytes or characters exactly as the API defines it. When diagnosing this result, converting lengths between UTF-16 characters, bytes, and array elements is a common source of repeated failures.
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.
MSMQ objects involved
| Subsystem | caller-owned output buffers paired with MSMQ length properties |
|---|---|
| Relevant condition | the API can know the required length even when the supplied storage cannot hold the complete value |
| Code-specific focus | sender-certificate retrieval buffer |
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 sender-certificate retrieval buffer.
Triage data
- 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.
Correct response
Resize only the certificate buffer and repeat a non-destructive peek when possible.
What this code is not
The condition is not evidence of low system memory. It describes the capacity and representation of one caller-owned output area. Code-specific condition: sender-certificate retrieval buffer.
Example failure path
A diagnostic collector encounters it. It uses the returned required length, keeps the operation non-destructive, and retries with correctly typed storage.
Technical references
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