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OSS_CANT_OPEN_TRACE_FILE
OSS_CANT_OPEN_TRACE_FILE (0x8009301B) is an OSS ASN.1 runtime result for trace output file could not be opened. The path configured for runtime diagnostics cannot be created or opened with the requested access and sharing mode. Because resolved absolute path and service account is central to this condition, Microsoft’s HRESULT range and the OSS Nokalva return-code documentation should be read together. Start the investigation by recording underlying OS error, share mode, and existing handle, then separate the encoded value from generated artifacts, call arguments, and the runtime package actually loaded by the process.
Avoid the wrong workaround: OSS_CANT_OPEN_TRACE_FILE
The encoded payload is not the first suspect here; the failure occurs while preparing diagnostic output.
Interpretation at runtime
At the trace output file could not be opened boundary, capture the first OSS function returning the value and note whether the operation was encode, decode, copy, compare, constraint validation, or trace setup. Preserve the selected PDU, encoding rules, and directory permissions, quota, and filename expansion; otherwise an outer certificate or security wrapper may hide the useful codec result behind a generic failure.
Diagnostic record
| Record | Diagnostic value |
|---|---|
| resolved absolute path and service account | Locates the concrete message, allocation, module, or API boundary |
| underlying OS error, share mode, and existing handle | Separates payload-dependent behavior from build and process state |
| directory permissions, quota, and filename expansion | Makes the comparison reproducible without rewriting the original artifact |
Keep the original bytes or object graph unchanged while testing open a unique file in a known writable directory. A change in underlying OS error, share mode, and existing handle after reload, plugin replacement, restart, or schema deployment is evidence about runtime state, not permission to discard the reproducer. When directory permissions, quota, and filename expansion points to one message, retain a cryptographic hash and the smallest safe sample instead of logging certificate, subscriber, credential, or private-key material.
Small experiments with high signal
- open a unique file in a known writable directory
- test the same identity outside the application
- separate trace failure from the codec return code
Decision matrix
| Controlled observation | Conclusion it supports |
|---|---|
| open a unique file in a known writable directory | A changed outcome isolates the first proposed control instead of a blind retry |
| resolved absolute path and service account differs between success and failure | The difference localizes the trace output file could not be opened boundary before unrelated settings are changed |
| An independent decoder accepts the same artifact | Inspect generated schema, selected rules, ABI, and optional OSS modules before declaring the bytes invalid |
| A fresh control object changes the outcome | Investigate initialization, lifecycle, allocator ownership, configuration mutation, and concurrent access |
Instrumentation
Record the full 32-bit HRESULT and lower OSS return number together with operation direction, symbolic PDU, encoding rule, byte count, and generated-table identifier. Where resolved absolute path and service account can expose sensitive content, a hash plus a bounded structural excerpt is safer than the complete payload. Use underlying OS error, share mode, and existing handle together with OSS module paths and versions logged once per process so packaging differences can be correlated without flooding normal diagnostics.
Proof of recovery: the result
Choose a writable, bounded log destination and retain the native file error when setup fails. A recovery test built around open a unique file in a known writable directory should replay the same operation under the same schema and encoding rule, retain one deliberately invalid control, and verify ownership and cleanup after both outcomes. Success after an unexamined retry is not proof that resolved absolute path and service account now satisfies the codec contract.
Technical references
- Microsoft: OSS ASN.1 HRESULT definitions
- OSS Nokalva: encoder/decoder return codes
- OSS Nokalva: runtime functions and control initialization
- Relevant ASN.1 specification or runtime detail
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