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CO_E_SERVER_EXEC_FAILURE
CO_E_SERVER_EXEC_FAILURE — 0x80080005
CO_E_SERVER_EXEC_FAILURE means that the SCM launched or attempted to launch the registered server, but the process did not register its class objects or terminated before activation completed.
Where the failure sits
COM activation is a sequence rather than a single operation: registration lookup, SCM or surrogate selection, process startup, class-factory publication, marshaling, and finally the requested interface call. The useful evidence is the evidence from the first stage that fails; a later RPC or cleanup message can otherwise hide the original activation problem.
A bad path prevents reliable process launch; server execution failure means startup was attempted but the COM handshake did not complete.
Facts to collect first
- Registered executable/service command, AppID, identity, and activation timeout
- Process creation result, exit code, crash dump, loader events, and command-line arguments
- CoRegisterClassObject timing and whether the server message loop remains alive
- Service dependencies, profile access, desktop interaction assumptions, and side-by-side/runtime dependencies
Change one variable at a time
- Start the server manually under its configured identity and observe its earliest failure.
- Instrument the interval from process creation to CoRegisterClassObject.
- Use a minimal server configuration to separate startup dependencies from COM registration.
Verification after correction
Apply the smallest change that addresses the first rejected condition: Fix the server’s early initialization, identity/profile dependency, class registration timing, or crash rather than increasing the activation timeout blindly.
Close the incident only when repeated cold activations start one healthy server, register the expected CLSID promptly, and survive concurrent client requests.
Technical references
These references define the HRESULT family and subsystem contract used above:
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