After you install MS16-077: Description of the security update for WPAD: June 14, 2016
, you cannot access websites by using Internet Explorer 11. This may occur if environment Web Proxy Automatic Discovery (WPAD) auto detection fails and if Internet Explorer is set to use a PAC file to determine the proxy server that has both the Automatically detect settings
and Use automatic configuration script
check boxes selected in the LAN settings of Internet options.