NASDAQ, the SEC, and others are attempting to piece together what caused a three-hour freeze in trading late last week, reports The Wall Street Journal . Sources say that officials are focusing particularly on two minutes about an hour before the shutdown, a period that could have signaled that major trading problems were coming. Between 10:53am and 10:55am, the NYSE Arca exchange apparently tried to connect to NASDAQ 30 times and failed, while NASDAQ was also having difficulty connecting to Arca. Though the problems seemed to have been fixed soon after, the multiple failed attempts are said to have overloaded NASDAQ's computers, stopping them from updating stock quotes and eventually making trading impossible.
via The Verge - All Posts http://www.theverge.com/2013/8/26/4659702/sec-and-nasdaq-probe-glitch-that-led-to-three-hour-trading-shutdown
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