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OSS_CONSTRAINT_DLL_NOT_LINKED
OSS_CONSTRAINT_DLL_NOT_LINKED (0x80093023) is an OSS ASN.1 runtime result for constraint-checker DLL absent. The optional module that evaluates generated ASN.1 constraints is unavailable when the application invokes constraint checking. Because constraint API and target type 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 module load result and link configuration, then separate the encoded value from generated artifacts, call arguments, and the runtime package actually loaded by the process.
Interpretation at runtime
At the constraint-checker DLL absent 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 whether encoding was expected to enforce the same checks; otherwise an outer certificate or security wrapper may hide the useful codec result behind a generic failure.
Keep the original bytes or object graph unchanged while testing call the checker on one known-invalid boundary value. A change in module load result and link configuration after reload, plugin replacement, restart, or schema deployment is evidence about runtime state, not permission to discard the reproducer. When whether encoding was expected to enforce the same checks points to one message, retain a cryptographic hash and the smallest safe sample instead of logging certificate, subscriber, credential, or private-key material.
Diagnostic record
| Record | Diagnostic value |
|---|---|
| constraint API and target type | Locates the concrete message, allocation, module, or API boundary |
| module load result and link configuration | Separates payload-dependent behavior from build and process state |
| whether encoding was expected to enforce the same checks | Makes the comparison reproducible without rewriting the original artifact |
Small experiments with high signal
- call the checker on one known-invalid boundary value
- inspect compiler options that emit constraint support
- verify the module version matches generated tables
Avoid the wrong workaround: the result
Skipping constraint checks can allow values that later encode incorrectly or violate the receiving protocol; it is not equivalent to success.
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 constraint API and target type can expose sensitive content, a hash plus a bounded structural excerpt is safer than the complete payload. Use module load result and link configuration together with OSS module paths and versions logged once per process so packaging differences can be correlated without flooding normal diagnostics.
Decision matrix
| Controlled observation | Conclusion it supports |
|---|---|
| call the checker on one known-invalid boundary value | A changed outcome isolates the first proposed control instead of a blind retry |
| constraint API and target type differs between success and failure | The difference localizes the constraint-checker DLL absent 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 |
Proof of recovery: the result
Include the checker component and keep a negative corpus for range, size, alphabet, and presence constraints. A recovery test built around call the checker on one known-invalid boundary value 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 constraint API and target type 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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