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How to Respond to DNSSEC Errors: A Case Study of the .de TLD Outage

·2026.05.07 02:00

Key point

This explains the DNSSEC signature error in the .de TLD that occurred on May 5, 2026, and how 1.1.1.1 responded to it.

Details

On May 5, 2026, DENIC published an incorrect DNSSEC signature for the .de TLD, causing millions of domains to become inaccessible.

1.1.1.1 used the serve stale approach to mitigate the impact of this outage. This allowed it to minimize service disruption while restoring normal resolution.

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