On 8/02/2014 1:31 a.m., Brandon Applegate wrote: > Hello, > > I'm running 3.1.19 (from Ubuntu 12.04 package). squid does a great job > of picking ipv6 first and using that (for sites that have AAAA and > respond). > > The problem is when a site's ipv6 connectivity is broken - squid doesn't > fall back to ipv4. An example at the moment is isc.sans.edu. I > contacted them and they may fix this by the time folks read this message > though. > There have been a number of small issues in this area found and fixed as of the latest 3.4.3 release. Please try an upgrade to the latest you can. Amos