Posts in macOS

Safari/Firefox Site not found errors

Numerous people have posted to the Apple discussion board regarding "site not found" errors, and web browsers requiring two attempts to load a page. This was REALLY annoying me, so I started doing some digging to see what was wrong. When I broke out tcpdump, I noticed that OS X was sending AAAA record ( these are the IPv6 equivalent to an IPv4 A record ) requests to my DNS server: Now, why Safari is causing the name resolution libraries to query "www.apple.com" when I visit is beyond me ( I will have to do some more digging). Since I am on a pure IPv4 network, I tried disabling IPv6 in the network preferences tab to see if it would stop sending AAAA record requests…