ERROR_DEBUG_ATTACH_FAILED

{Unexpected Failure in [**DebugActiveProcess**](https://learn.microsoft.com/en-us/windows/win32/api/debugapi/nf-debugapi-debugactiveprocess)} An unexpected failure occurred while processing a **DebugActiveProcess** API request.

Matched as: the code as given (hex)

{Unexpected Failure in DebugActiveProcess} An unexpected failure occurred while processing a DebugActiveProcess API request. You may choose OK to terminate the process, or Cancel to ignore the error.

Source: System Error Codes (500-999) - Win32 apps · CC-BY-4.0 (MicrosoftDocs/sdk-api, repo license verified 2026-10-09) · retrieved 2026-10-09