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Let me bet: it's DNS. It's always DNS.

• ne0n 5y ago
  It was, but I don't know why. I'm curious to hear if Heroku releases any information about how this happened. Heroku's DNS was returning a single 100.64.x.x address which is in a reserved range.
  • jpmw 5y ago
    They typically publish post-mortems, I think? Not 100% sure. They definitely do in-house. We'll have to wait and see I guess.