RPC_S_UNKNOWN_AUTHN_SERVICE 0x800706D3

Error code 1747 · HRESULT 0x800706D3

WINDOWS

The authentication service 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_AUTHN_SERVICE is a Windows error code (system error 1747, returned as HRESULT 0x800706D3) reported by Windows. Its official message is: “The authentication service is unknown.”

How to fix RPC_S_UNKNOWN_AUTHN_SERVICE

  1. Run the affected program as administrator (right-click → Run as administrator)
  2. Check permissions on the target resource: Properties → Security → your account
  3. Check Event Viewer → Windows Logs → Security for the matching audit entry

Related errors

RPC_S_UNKNOWN_AUTHN_LEVELRPC_S_UNKNOWN_AUTHN_TYPERPC_S_UNKNOWN_AUTHZ_SERVICERPC_S_UNKNOWN_IFRPC_S_BINDING_HAS_NO_AUTHRPC_S_PROCNUM_OUT_OF_RANGERPC_S_INVALID_AUTH_IDENTITY

Source: Microsoft WinError.h

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