RPC_S_UNKNOWN_IF 0x800706B5

Error code 1717 · HRESULT 0x800706B5

WINDOWS

The interface is unknown.

Windows troubleshooting diagram: Device Manager warning and a system file scan
Windows errors: check drivers, system files and Event Viewer, in that order.

What it means

RPC_S_UNKNOWN_IF is a Windows error code (system error 1717, returned as HRESULT 0x800706B5) reported by Windows. Its official message is: “The interface is unknown.”

How to fix RPC_S_UNKNOWN_IF

  1. Reboot once — many one-off system codes disappear with a clean restart
  2. Repair system files: 'sfc /scannow' then 'DISM /Online /Cleanup-Image /RestoreHealth'
  3. Find the source in Event Viewer → System: filter for this exact code and open its provider link

Related errors

RPC_S_UNKNOWN_MGR_TYPERPC_S_UNKNOWN_AUTHN_TYPERPC_S_UNKNOWN_AUTHN_SERVICERPC_S_UNKNOWN_AUTHN_LEVELRPC_S_SERVER_UNAVAILABLERPC_S_NO_BINDINGSRPC_S_NOT_LISTENING

Source: Microsoft WinError.h

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