DENIC .de TLD DNSSEC Outage

Thu, 21 May 2026 00:00:00 +0000

Incident: DENIC .de TLD DNSSEC Outage Date: 2026-05-05 | Duration: ~None hours | Severity: P0-critical Affected: Millions of domains unreachable | Systems: .de TLD DNSSEC validation, DNS resolvers globally Root cause (summary): DENIC, the registry operator for the .de TLD, published incorrect DNSSEC signatures for the .de zone.

Incident Summary

On May 5, 2026, the internet experienced a significant disruption affecting millions of domains under the .de country-code top-level domain (ccTLD). This outage was triggered when DENIC, the authoritative registry operator for the .de TLD, began publishing incorrect DNSSEC signatures for its zone.

QUIC Congestion Window Stalling Due to Linux Kernel Idle Optimization Misport: Engineering Postmortem

Sun, 17 May 2026 00:00:00 +0000

Incident: QUIC Congestion Window Stalling Due to Linux Kernel Idle Optimization Misport Date: 2023-08-15 (Discovered) | Duration: Latent for years, ~6 hours (diagnosis & fix deployment) | Severity: P1-high Affected: All Cloudflare QUIC connections utilizing the quiche library, impacting global user experience, especially after packet loss. Systems: Cloudflare quiche QUIC implementation, Linux kernel CUBIC porting layer, QUIC-enabled services. Root cause (summary): Incorrect calculation of “idle” periods in quiche’s CUBIC congestion control port, preventing congestion window recovery after packet loss by perpetually resetting the idle timer.

Outage on AI VOID

DENIC .de TLD DNSSEC Outage

Incident Summary

QUIC Congestion Window Stalling Due to Linux Kernel Idle Optimization Misport: Engineering Postmortem