CloudFlare must be rolling out new changes: I’ve seen the NetBSD Planet fail with a “cloudflare-nginx” generated “500 Internal Server Error” for an hour or two the past couple of nights. Last night at around 9pm UTC it happened again and didn’t recover. I changed the backend from an IPv6 address to IPv4 and that brought the site back.
Eventually we’ll have to live with just IPv6 addresses, so this is an unfortunate regression on CloudFlare’s part.