Chrome's Private DNS Masked 5-Hour Wi-Fi Outage That Crashed Background Jobs

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On September 12, 2026, four automated jobs failed between 5:01 a.m. and 8:41 a.m. due to DNS resolution errors, while Chrome continued browsing normally using its own built-in DNS-over-HTTPS cache. Analysis of system logs revealed 4,960 SlowWiFiDnsFailure events from airportd, peaking at 1,720 in a single hour, with the disruption ending only after the user manually switched to mobile tethering at 1:09 p.m. Unlike Chrome, Node.js and Python rely on the system resolver tied to the home router, making them vulnerable when only the DNS path fails. To prevent silent recurrences, the author built a lightweight script that logs a one-line network-state snapshot every five minutes, enabling after-the-fact diagnosis without depending on system log retention windows.

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