What does HRESULT 0x80010100 (RPC_E_SYS_CALL_FAILED) mean?

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A Windows system call required by the COM RPC runtime failed while it was processing the call.

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RPC_E_SERVER_DIED_DNE	RPC_E_OUT_OF_RESOURCES

RPC_E_SYS_CALL_FAILED

RPC_E_SYS_CALL_FAILED means that a system call used by the COM RPC runtime failed. It is a wrapper-level HRESULT, so the surrounding logs and any earlier Win32 or RPC error are needed to identify the actual failed operation.

What to collect

Record the first failure in the client and server logs, not only the final COM HRESULT.
Check process resources, security context, service availability, and the active RPC endpoint.
Reproduce with the same user, process architecture, and deployment version where possible.

A generic system-call failure should not be diagnosed as a COM registration problem without supporting evidence.

Microsoft: COM error codes

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