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In Pictures: The most mortifying moments in IT sec...
A bad software update to AT&T #4ESS switches in January 1990 caused a cascading switch failure, leaving 60,000 people without long-distance service for 9 hours. “The software told Switch B ‘My CCS7 processor is insane,’ so Switch B shut itself down to void spreading the problem,” was how Larry Seese, AT&T's director of technology explained it to Telephony magazine at the time.
In Pictures: The most mortifying moments in IT security history