HRESULT 0x80010121 (RPC_E_FULLSIC_REQUIRED): meaning and diagnosis

Status / error code:

Category:

Constant name:

Source:

Facility:

Operating System:

Description:

COM security requires a full subject-issuer certificate chain principal

Previous	Next
RPC_E_NO_SYNC	RPC_E_INVALID_STD_NAME

RPC_E_FULLSIC_REQUIRED

COM security requires a full subject-issuer certificate chain principal

RPC_E_FULLSIC_REQUIRED is HRESULT 2147549473 (0x80010121) from winerror.h. AllStat describes it as “Full subject issuer chain SSL principal name expected from the server.” In the COM/RPC call control, message filtering, apartment routing, marshaling, security negotiation, or remote object lifetime, the code identifies a specific failure boundary and should not be replaced by a generic COM exception.

Telemetry should preserve this result as a separate outcome rather than merging it with unrelated COM or WinRT failures.

Where it is encountered

Cross-apartment or cross-process COM method invocation and activation. Record the interface, method, component version, thread, apartment, process, and correlation ID.
STA message filtering, reentrancy, call cancellation, timeout, or retry handling.
DCOM security initialization, proxy/stub marshaling, OBJREF processing, and server object lifetime.

The immediate focus for it is SSL or Schannel principal-name validation configured to require full subject issuer chain form rather than a shorter principal. Keep it attached to that operation; the same numeric severity outside the owning API does not supply enough context.

Decisive interpretation boundary

Before choosing recovery, verify that the server certificate chain, principal-name syntax, authentication service, and COM security capability flags are captured. The decisive boundary for it determines whether the same object can continue, a new object is required, or policy must change.

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.

Difference from nearby HRESULTs

It requests a richer certificate principal representation; RPC_E_INVALID_STD_NAME rejects malformed msstd: syntax.

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

Correct handling and recovery

Construct the full required principal from validated certificate chain data or align security configuration on both ends. Never disable validation to bypass the mismatch.

Backoff alone is not a repair for it; a measurable state or configuration transition must justify another attempt.

Practical scenario

A client supplies only a common name while the server policy requires the full subject/issuer chain. Deployment generates the expected principal from the trusted certificate.

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

Lifetime, retry, and cleanup rules

After it, determine whether the current object, interface pointer, call context, token, stream, metadata reader, asynchronous operation, or access-control instance remains valid. 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 it should state the trigger, maximum attempts, cancellation owner, and reconciliation step for effects that may have completed elsewhere.

References

Looking for a different code? Search another status or error code.