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A growing archive of public postmortems, broken down into a consistent shape: what broke, why it cascaded, and what to take from it. New incidents added regularly.

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topic: denic
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FM-017
The DNSSEC Failure That Made .de Look FakeIncorrect DNSSEC signatures for Germany's .de top-level domain caused validating resolvers to reject .de answers, leading Cloudflare to temporarily bypass DNSSEC validation for the zone.
Cloudflare
2026-05-05
2h 47m
SEV-2
denicde-dnssecdns