NYSE: Bad software upgrade reason for outage

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NEW YORK (AP) -- The New York Stock Exchange says an outage of more than three hours was caused by problems associated with a software upgrade on the exchange's computers.

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NYSE: Bad software upgrade reason for outage
Traders work on the floor at the New York Stock Exchange in New York, Wednesday, July 8, 2015. Hong Kong's main stock index plummeted as much as 8.5 percent on Wednesday as a sell-off in mainland Chinese shares accelerated despite new measures to support the market; U.S. stocks were poised to open lower. (AP Photo/Seth Wenig)
Traders work on the floor at the New York Stock Exchange in New York, Wednesday, July 8, 2015. Hong Kong's main stock index plummeted as much as 8.5 percent on Wednesday as a sell-off in mainland Chinese shares accelerated despite new measures to support the market; U.S. stocks were poised to open lower. (AP Photo/Seth Wenig)
A man is reflected in a screen showing stock indexes of Asian markets at Hong Kong Exchanges in Hong Kong, Wednesday, July 8, 2015. The Hang Seng Index has dropped in morning trading following more big losses on mainland markets. Chinese stocks led a slump in Asian markets on Wednesday as the sell-off in Shanghai intensified and Greece's future in the euro remained highly uncertain. (AP Photo/Kin Cheung)
Traders work on the floor at the New York Stock Exchange in New York, Wednesday, July 8, 2015. Hong Kong's main stock index plummeted as much as 8.5 percent on Wednesday as a sell-off in mainland Chinese shares accelerated despite new measures to support the market; U.S. stocks were poised to open lower. (AP Photo/Seth Wenig)
Traders work on the floor at the New York Stock Exchange in New York, Wednesday, July 8, 2015. Hong Kong's main stock index plummeted as much as 8.5 percent on Wednesday as a sell-off in mainland Chinese shares accelerated despite new measures to support the market; U.S. stocks were poised to open lower. (AP Photo/Seth Wenig)
Traders work on the floor at the New York Stock Exchange in New York, Wednesday, July 8, 2015. Hong Kong's main stock index plummeted as much as 8.5 percent on Wednesday as a sell-off in mainland Chinese shares accelerated despite new measures to support the market; U.S. stocks were poised to open lower. (AP Photo/Seth Wenig)
Screens display financial information on the floor at the New York Stock Exchange in New York, Wednesday, July 8, 2015. Hong Kong's main stock index plummeted as much as 8.5 percent on Wednesday as a sell-off in mainland Chinese shares accelerated despite new measures to support the market; U.S. stocks were poised to open lower. (AP Photo/Seth Wenig)
Traders work on the floor at the New York Stock Exchange in New York, Wednesday, July 8, 2015. Hong Kong's main stock index plummeted as much as 8.5 percent on Wednesday as a sell-off in mainland Chinese shares accelerated despite new measures to support the market; U.S. stocks were poised to open lower. (AP Photo/Seth Wenig)
Traders work on the floor at the New York Stock Exchange in New York, Wednesday, July 8, 2015. Hong Kong's main stock index plummeted as much as 8.5 percent on Wednesday as a sell-off in mainland Chinese shares accelerated despite new measures to support the market; U.S. stocks were poised to open lower. (AP Photo/Seth Wenig)
Traders work on the floor at the New York Stock Exchange in New York, Wednesday, July 8, 2015. Hong Kong's main stock index plummeted as much as 8.5 percent on Wednesday as a sell-off in mainland Chinese shares accelerated despite new measures to support the market; U.S. stocks were poised to open lower. (AP Photo/Seth Wenig)
Traders work on the floor at the New York Stock Exchange in New York, Wednesday, July 8, 2015. Hong Kong's main stock index plummeted as much as 8.5 percent on Wednesday as a sell-off in mainland Chinese shares accelerated despite new measures to support the market; U.S. stocks were poised to open lower. (AP Photo/Seth Wenig)
Traders work on the floor at the New York Stock Exchange in New York, Wednesday, July 8, 2015. Hong Kong's main stock index plummeted as much as 8.5 percent on Wednesday as a sell-off in mainland Chinese shares accelerated despite new measures to support the market; U.S. stocks were poised to open lower. (AP Photo/Seth Wenig)
People sit on a bench near the New York Stock Exchange, Wednesday, July 8, 2015. Hong Kong's main stock index plummeted as much as 8.5 percent on Wednesday as a sell-off in mainland Chinese shares accelerated despite new measures to support the market. U.S. stocks were poised to open lower. (AP Photo/Seth Wenig)
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The NYSE said in a statement Thursday that the upgrade caused communication problems between its trading software and other systems, causing customers' orders to not go through.

The problem became severe enough by late morning Wednesday that the exchange decided to suspend trading at 11:32 a.m. Eastern time so the problem could be addressed. Orders were cancelled, trading software was restarted and backup units were brought online, the exchange said.

The exchange restarted trading at 3:10 p.m. Eastern.

NYSE Composite Index (Volume) - 1 Year | FindTheData

Wednesday's shutdown was a black eye for the NYSE, but ultimately it did not broadly impact Wednesday's trading. The Nasdaq still operated normally and several other exchanges were also available for investors to execute trades while the NYSE worked through its problems. While the exchange was only open for 50 minutes in the afternoon, it was enough time for investors to close out their positions for the day.

The outage came at a time when traders had plenty of other things to worry about. There have been concerns about China's plunging stock market and a logjam in talks between Greece and its creditors that has weighed on investors' mood all week.



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