RPC_S_FP_UNDERFLOW 0x800706EA

Error code 1770 · HRESULT 0x800706EA

WINDOWS

A floating-point underflow occurred at the RPC server.

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_FP_UNDERFLOW is a Windows error code (system error 1770, returned as HRESULT 0x800706EA) reported by Windows. Its official message is: “A floating-point underflow occurred at the RPC server.”

How to fix RPC_S_FP_UNDERFLOW

  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_FP_DIV_ZERORPC_S_FP_OVERFLOWRPC_S_ADDRESS_ERRORRPC_X_NO_MORE_ENTRIESRPC_S_ZERO_DIVIDEERROR_PROC_NOT_FOUNDERROR_DIR_NOT_EMPTYERROR_BAD_EXE_FORMAT

Source: Microsoft WinError.h

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