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Cisco Small Business Switches Face Global DNS Crash Outage

Network administrators worldwide reported widespread crashes in Cisco small business switches on January 8, 2026, triggered by fatal errors in the DNS client service. Devices entered reboot loops every few minutes, disrupting operations until DNS configurations were removed. The issue surfaced around 2 AM UTC, affecting models like CBS250, C1200, CBS350, SG350, and SG550X series […]