What does HRESULT 0x8027000C (NAP_E_SERVICE_NOT_RUNNING) mean?

 
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NAP_E_SERVICE_NOT_RUNNING

The NapAgent service is not running

NAP_E_SERVICE_NOT_RUNNING is HRESULT 0x8027000C (signed decimal -2144927732, unsigned decimal 2150039564). AllStat, using winerror.h, describes it as “The NapAgent service is not running.” The value has failure severity, facility 0x27, and code field 0x000C.

This is a legacy Network Access Protection result: Microsoft states that NAP is unavailable starting with Windows 10 and that current Windows Server releases do not include the former NAP, HRA, and HCAP roles; use the code for supported legacy systems, archived telemetry, compatibility components, or migrations rather than assuming a modern machine should expose the old platform.

Platform availability must be checked before service recovery

This code names the client-side Network Access Protection Agent service. On systems that supported NAP, the service hosted the broker between system health agents, enforcement clients, and cached SoH state. Microsoft now states that the NAP platform is unavailable starting with Windows 10, and NAP/HRA/HCAP are not available in Windows Server 2016 or later. On those systems, absence of NapAgent is a platform fact, not a service-start failure to remediate.

Legacy-system causes

  • The NapAgent service is stopped, disabled, or still starting on a Windows version that includes NAP.
  • Service startup failed because a dependency, service account, or system component is damaged.
  • A component starts before service control reports NapAgent ready and does not handle the transition.
  • An upgrade or security baseline intentionally disabled the obsolete NAP client role.
  • The application was moved to Windows 10 or a newer Windows Server release where the platform is not present.

Service and platform evidence

  • Record Windows product, version, build, and role before attempting any service action.
  • On a supported legacy client, capture service state, startup type, service exit code, and nearby Service Control Manager events.
  • Log the NAP interface or COM activation that failed and distinguish this HRESULT from RPC_E_DISCONNECTED during a restart.
  • Document whether the deployment genuinely depends on NAP enforcement or only contains leftover compatibility code.

Decision path

  • If the operating system no longer contains NAP, stop troubleshooting the missing service and migrate the health-enforcement design.
  • If the platform is supported, verify service configuration and start NapAgent through normal service management.
  • After start, allow bindings documented to recover automatically, then perform a new SoH exchange rather than trusting old state.
  • Investigate repeated stops from event logs and component failures instead of configuring an unconditional restart loop.

Difference from nearby NAP results

NAP_E_NOT_INITIALIZED means the component has not completed its binding lifecycle even if NapAgent is available. NAP_E_ENTITY_DISABLED means a registered entity is administratively disabled inside the agent. RPC_E_DISCONNECTED is the interface-level signal documented when NapAgent stops and may automatically recover after restart.

Retry and recovery

On a supported legacy system, a bounded service restart followed by rebind and fresh health evaluation can be valid. On Windows 10 or Windows Server 2016 and later, retrying service start is not a solution because the platform is unavailable. Migration planning should preserve the intended policy outcome—endpoint compliance and access control—without pretending a modern NAP replacement is the same API.

Practical scenario

A vendor’s old enforcement plug-in is installed on Windows 11 and reports NAP_E_SERVICE_NOT_RUNNING. Service Control Manager has no NapAgent service because NAP was removed from the client platform. The fix is to disable or modernize the plug-in, not to import a legacy service registration.

References

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