ERROR_INVALID_SIGNAL_NUMBER 0x800700D1

Error code 209 · HRESULT 0x800700D1

WINDOWS

The signal being posted is not correct.

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

ERROR_INVALID_SIGNAL_NUMBER is a Windows error code (system error 209, returned as HRESULT 0x800700D1) reported by Windows. Its official message is: “The signal being posted is not correct.”

How to fix ERROR_INVALID_SIGNAL_NUMBER

  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

ERROR_FILENAME_EXCED_RANGEERROR_META_EXPANSION_TOO_LONGERROR_THREAD_1_INACTIVE0xC19001010xC19002080xC19002000xC1900223STATUS_ACCESS_VIOLATION

Source: Microsoft WinError.h

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