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WININET_E_UNABLE_TO_DOWNLOAD_SCRIPT
WININET_E_UNABLE_TO_DOWNLOAD_SCRIPT means that WinINet could not download the automatic proxy-configuration script. Microsoft documents this result in the case where INTERNET_FLAG_MUST_CACHE_REQUEST is set.
What to check
- Whether the PAC URL itself can be resolved and reached from the current network.
- Whether bootstrap proxy settings create a loop while trying to fetch the proxy script.
- Whether TLS, authentication, cache policy, or firewall rules prevent retrieving the script.
Operational distinction
This error is different from an invalid PAC script: here WinINet could not obtain the script at all. Log the PAC retrieval endpoint separately from the original request endpoint, otherwise troubleshooting can focus on the wrong host.
Microsoft: WinINet error messages · Microsoft: InternetErrorDlg
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