All my sites that use GitHub Pages are down (1016)

What is the name of the domain?

runfile.dannyb.co, bashly.dannyb.co

What is the error number?

1016

What is the error message?

Origin DNS error

What is the issue you’re encountering

All sites report 1016

What steps have you taken to resolve the issue?

  • Tested that GitHub pages work properly when not using Cloudflare DNS (direct access).
  • Ensured that nothing changed in the Cloudflare DNS settings for these sites
  • Looked at Cloudflare status page - no relevant issues (although there is an active billing related issue).
  • Looked at GitHub status page - all systems are green

What feature, service or problem is this related to?

DNS records

What are the steps to reproduce the issue?

# Failing request
$ curl https://bashly.dannyb.co/
error code: 1016

# successful request
$ curl -I https://dannyben.github.io/experiments/
HTTP/2 200
server: GitHub.com
# ...

Please refer to Cloudflare Documentation on here in regards to the error 1016.