RPC_S_UNKNOWN_AUTHN_LEVEL 0x800706D4

Error code 1748 · HRESULT 0x800706D4

WINDOWS

The authentication level 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_LEVEL is a Windows error code (system error 1748, returned as HRESULT 0x800706D4) reported by Windows. Its official message is: “The authentication level is unknown.”

How to fix RPC_S_UNKNOWN_AUTHN_LEVEL

  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_SERVICERPC_S_UNKNOWN_AUTHN_TYPERPC_S_UNKNOWN_AUTHZ_SERVICERPC_S_UNKNOWN_IFRPC_S_INVALID_AUTH_IDENTITYRPC_S_BINDING_HAS_NO_AUTHRPC_S_PROCNUM_OUT_OF_RANGE

Source: Microsoft WinError.h

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