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| WININET_E_PROXY_SERVER_UNREACHABLE | WININET_E_UNABLE_TO_DOWNLOAD_SCRIPT |
WININET_E_BAD_AUTO_PROXY_SCRIPT
WININET_E_BAD_AUTO_PROXY_SCRIPT means that the automatic proxy-configuration script is invalid. The failure is in the PAC configuration or its evaluation, not necessarily in the requested website or proxy server.
How to investigate
- Identify the PAC URL and the exact user context whose WinINet settings are active.
- Fetch and validate the script content, MIME delivery, syntax, and proxy decisions for the affected URL.
- Check whether the script changed recently or relies on DNS functions that are unavailable on the affected network.
Separate script failure from connectivity failure
A broken PAC script can direct a request to no proxy or the wrong proxy. Validate the proxy decision independently before diagnosing the destination site as unavailable.
Microsoft: WinINet error messages · Microsoft: InternetErrorDlg proxy-script handling
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