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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
- resolved absolute path and service account
- underlying OS error, share mode, and existing handle
- directory permissions, quota, and filename expansion
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
Instrumentation
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.
Technical references
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