More detail on what exactly caused NYSE's trading glitch on Tuesday
A trader works on the floor of the New York Stock Exchange.
Peter Kramer | CNBC
NYSE President Lynn Martinand other exchange officials confirmed to CNBC that the root cause of the Big Board's trading glitch at the Tuesday open was due toa manual error involving the Exchange's Disaster Recovery configuration.
After the 9/11 disaster, the NYSE was obligated to maintain a primary trading site (at the NYSE) and a back-up site (which is in Chicago).
On Monday evening, routine maintenance was being performed on the software for the Chicago back-up site.
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