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CO_E_FAILEDTOOPENTHREADTOKEN
COM could not open the current thread token
CO_E_FAILEDTOOPENTHREADTOKEN is HRESULT 2147549477 (0x80010125) from winerror.h. The documented description is “Unable to open the access token of the current thread.” The relevant context is the COM IAccessControl, DCOM client identity, trustee translation, token inspection, security descriptor, ACL, or serialization workflow.
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 security processing that expects an impersonation token on the current thread but cannot open it with the required access.
What to verify
Verify that the thread is impersonating as expected and token access rights, privileges, and revert state are known.
Correct handling and recovery
Fix impersonation lifetime or token access, request only required rights, and ensure RevertToSelf is balanced after use.
Reconcile partial output and server-side effects before attempting the operation again.
Difference from nearby HRESULTs
It is thread-token acquisition; CO_E_FAILEDTOOPENPROCESSTOKEN concerns the server process token.
Practical scenario
A helper runs after a scope guard reverted impersonation. The authorization check is moved before revert and opens the token with TOKEN_QUERY only.
References
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