ERROR_WINHTTP_AUTODETECTION_FAILED

Returned by [**WinHttpDetectAutoProxyConfigUrl**](https://learn.microsoft.com/en-us/windows/desktop/api/Winhttp/nf-winhttp-winhttpdetectautoproxyconfigurl) if WinHTTP was unable to discover the URL of the Proxy Auto-Configuration (PAC) file.

Matched as: the code as given (hex)

Source: WinHTTP Error Messages · CC-BY-4.0 (MicrosoftDocs/sdk-api, repo license verified 2026-10-09) · retrieved 2026-10-09