What does HRESULT 0x8001012D (CO_E_INVALIDSID) mean?

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CO_E_WRONGTRUSTEENAMESYNTAX	CO_E_CONVERSIONFAILED

CO_E_INVALIDSID

A supplied security identifier is invalid

CO_E_INVALIDSID is HRESULT 2147549485 (0x8001012D) from winerror.h. AllStat describes it as “One of the security identifiers provided by the user was invalid.” In the COM IAccessControl, DCOM client identity, trustee translation, token inspection, security descriptor, ACL, or serialization workflow, the code identifies a specific failure boundary and should not be replaced by a generic COM exception.

The caller should keep CO_E_INVALIDSID intact through logging, exception translation, and RPC or language projection boundaries.

Where it is encountered

• CO_E_INVALIDSID can be returned during IAccessControl initialization, access checks, owner/trustee processing, and serialized ACL persistence. For CO_E_INVALIDSID, record the interface, method, component version, thread, apartment, process, and correlation ID.
• CO_E_INVALIDSID can be returned during server-side DCOM impersonation, client blanket inspection, token and SID lookup. For CO_E_INVALIDSID, record the interface, method, component version, thread, apartment, process, and correlation ID.
• CO_E_INVALIDSID can be returned during security descriptor construction, DACL canonicalization, file-backed policy storage, or legacy NetAccess migration. For CO_E_INVALIDSID, record the interface, method, component version, thread, apartment, process, and correlation ID.

The immediate focus for CO_E_INVALIDSID is an ACL, trustee, token, or serialized access-control structure containing a SID that fails structural validation. Keep CO_E_INVALIDSID attached to that operation; the same numeric severity outside the owning API does not supply enough context.

Evidence and telemetry

• Preserve SID binary length and revision for CO_E_INVALIDSID.
• Preserve subauthority count and values for CO_E_INVALIDSID.
• Preserve IsValidSid result for CO_E_INVALIDSID.
• Preserve source token, directory, or file for CO_E_INVALIDSID.
• Preserve trusted replacement SID for CO_E_INVALIDSID.

For CO_E_INVALIDSID, also record UTC time, process and thread IDs, apartment type, component version, security or package identity where relevant, and a correlation ID. For CO_E_INVALIDSID, use hashes, lengths, GUIDs, and SID strings rather than logging confidential payloads or credentials.

Decisive interpretation boundary

Before choosing recovery, verify that SID length, revision, subauthority count, memory extent, and provenance are known before dereferencing or copying it. The decisive boundary for CO_E_INVALIDSID determines whether the same object can continue, a new object is required, or policy must change.

For CO_E_INVALIDSID, also confirm that all observed objects, tokens, buffers, proxies, metadata files, or ACLs belong to the current operation generation and were not retained from an earlier attempt.

Correct handling and recovery

Reject the SID, regenerate it from a trusted account lookup or token, and validate serialized lengths at every boundary.

For CO_E_INVALIDSID, reconcile partial output and server-side effects before attempting the operation again.

Diagnostic sequence

• Capture the raw unsigned value 0x8001012D and symbolic name CO_E_INVALIDSID before a language projection, exception wrapper, or generic COM helper replaces it.
• Identify the exact interface, method, callback, activation request, metadata query, access-control operation, or marshaling boundary that returned CO_E_INVALIDSID.
• Reconstruct the operation timeline for CO_E_INVALIDSID, including object creation, thread or apartment initialization, security setup, callbacks, mutations, shutdown, and cleanup.
• Prove the decisive condition: SID length, revision, subauthority count, memory extent, and provenance are known before dereferencing or copying it.
• Inspect every output parameter, handle, interface pointer, token, SID, ACL, stream, buffer, server-side object, or asynchronous result produced before CO_E_INVALIDSID.
• Reproduce CO_E_INVALIDSID with the smallest safe input, change only the suspected precondition, and verify that both the HRESULT and postcondition change as predicted.

Lifetime, retry, and cleanup rules

After CO_E_INVALIDSID, determine whether the current object, interface pointer, call context, token, stream, metadata reader, asynchronous operation, or access-control instance remains valid. For CO_E_INVALIDSID, release only resources owned by the failing attempt, cancel callbacks through their documented mechanism, and avoid double close, double commit, repeated activation, or replay of a non-idempotent remote method.

The retry policy for CO_E_INVALIDSID should state the trigger, maximum attempts, cancellation owner, and reconciliation step for effects that may have completed elsewhere.

Practical scenario

A custom policy file truncates the final subauthority of a SID. Import validation rejects the entry and obtains a fresh SID from the account name.

A regression test should reproduce CO_E_INVALIDSID, assert the raw HRESULT and all relevant outputs, then correct only the decisive condition and verify the intended success or neighboring failure result.

Difference from nearby HRESULTs

CO_E_INVALIDSID is structural invalidity; CO_E_NOMATCHINGNAMEFOUND can involve a structurally valid SID with no resolvable account name.

Tests for CO_E_INVALIDSID should force both results and verify that object lifetime, output use, and user messaging differ.

Developer and administrator guidance

Dashboards should classify CO_E_INVALIDSID by its actual cause category—lifetime, timing, apartment, marshaling, identity, authorization, format, buffer, or storage—rather than grouping every COM failure under one counter.

Administrators investigating CO_E_INVALIDSID should preserve first-occurrence evidence before restarting COM servers, repairing packages, editing DCOM policy, or replacing serialized access data. Define who owns retry, cancellation, cleanup, policy changes, package repair, and user-facing messaging for CO_E_INVALIDSID.

References

• Microsoft: IAccessControl — official Microsoft documentation relevant to CO_E_INVALIDSID.
• Microsoft: IAccessControl::IsAccessAllowed — official Microsoft documentation relevant to CO_E_INVALIDSID.
• Microsoft: AccessCheck — official Microsoft documentation relevant to CO_E_INVALIDSID.
• Microsoft: LookupAccountSidW — official Microsoft documentation relevant to CO_E_INVALIDSID.
• Microsoft: LookupAccountNameW — official Microsoft documentation relevant to CO_E_INVALIDSID.
• Microsoft: access control lists — official Microsoft documentation relevant to CO_E_INVALIDSID.
• Microsoft: canonical ACE order — official Microsoft documentation relevant to CO_E_INVALIDSID.
• Microsoft: HRESULT values — official Microsoft documentation relevant to CO_E_INVALIDSID.

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