PACtory Proxy Auto Config Generator download | SourceForge.net
WinHttpDetectAutoProxyConfigUrl function (winhttp.h
Note: If PAC files are pushed by GPO, then that can cause connectivity issues for users of the VPN. Consider this scenario: The PAC file is an Internal URL, not resolvable externally. When IE is opened without being connected to the VPN, the PAC file fails to be found, and thus no Proxy settings are applied, thus there are no issues.