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CO_E_CONVERSIONFAILED
Trustee string conversion failed
CO_E_CONVERSIONFAILED is HRESULT 2147549486 (0x8001012E) from winerror.h. The documented description is “Unable to convert a wide character trustee string to a multibyte trustee string.” The relevant context is the COM IAccessControl, DCOM client identity, trustee translation, token inspection, security descriptor, ACL, or serialization workflow.
The hexadecimal value and symbolic name of this result should remain attached to the originating API and operation instance.
What to verify
Verify that source encoding, code page, destination capacity, invalid-character policy, and account-name round trip are explicit.
Where it is encountered
- IAccessControl initialization, access checks, owner/trustee processing, and serialized ACL persistence.
- Server-side DCOM impersonation, client blanket inspection, token and SID lookup.
- Security descriptor construction, DACL canonicalization, file-backed policy storage, or legacy NetAccess migration.
The immediate focus is conversion of a wide trustee name to a multibyte representation required by a legacy access-control path.
Correct handling and recovery
Keep Unicode end to end where possible; otherwise use strict conversion with required-size calculation and reject lossy identity transformations.
Difference from nearby HRESULTs
It is character conversion; trustee syntax and lookup HRESULTs describe later identity parsing or resolution.
Developer and administrator guidance
After it, avoid broad permission grants or system-wide resets unless code-specific evidence proves a global configuration problem.
Practical scenario
A trustee contains characters absent from the configured ANSI code page. The component switches its persistence format to Unicode instead of substituting question marks.
References
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