告诉HN：HN的IPv6地址无法访问。
HN在IPv4上运行正常（209.216.230.207），但在IPv6上似乎无法访问（2606:7100:1:67::26），我从多个地点进行了检查。没有任何HN状态监测工具能够捕捉到这个问题。“Happy eyeballs”机制使得在双栈IPv4/IPv6网络上一切正常，但在我的情况下，我是通过一个显然偏好IPv6的代理访问的，只有在超时后才会切换到IPv4。（这证明了IPv6逐步推广的有效性，99.9%的时间都能正常工作！）
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HN on IPv4 works fine (209.216.230.207) but appears down on IPv6 (2606:7100:1:67::26), checked from multiple points. None of the HN status monitors appear to catch this. “Happy eyeballs” keeps everything working fine on a dual IPv4/IPv6 network, but in my case I am visiting via a proxy that apparently prefers IPv6, switching over only when it hits a timeout. (It’s a testament to the gradual IPv6 rollout that this works 99.9% of the time!).