Microsoft IPv6-Aware Proxy Helper API Definitions supported in Firefox?
Can no longer reach the internet through our proxy server using our global corporate proxy PAC file after updating the PAC file with Microsoft's 'IPv6-Aware Proxy Helper API Definitions' (http://msdn.microsoft.com/en-us/library/windows/desktop/gg308477(v=vs.85).aspx). MS IE 8 and IE 9 work OK, as does Google Chrome. Firefox (our standard browser on non-Microsoft operating systems) is no longer functional with the new PAC file updates.
Can no longer reach the internet through our proxy server using our global corporate proxy PAC file after updating the PAC file with Microsoft's 'IPv6-Aware Proxy Helper API Definitions' (http://msdn.microsoft.com/en-us/library/windows/desktop/gg308477(v=vs.85).aspx). MS IE 8 and IE 9 work OK, as does Google Chrome. Firefox (our standard browser on non-Microsoft operating systems) is no longer functional with the new PAC file updates.
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Have you read that? Note This functionality requires Windows Internet Explorer 7 or greater. on MSDN?
In the about:config window, look up "network.dns.disableIPv6". Is that set to true? If so, toggle it to false.