Amazon Website Goes Briefly Offline Before Homepage Restored Inc.’s home page went offline for about 49 minutes, leaving shoppers unable to call up the main Web address,

The landing page of the world’s largest Internet retailer was available to some customers today, Ty Rogers, a spokesman for Seattle-based Amazon, said in an e-mailed statement. He didn’t specify a reason for the disruption.

Efforts by computer and mobile-phone users in San Francisco, Chicago and New York to call up the website resulted in a page that read only “Service Unavailable” at least as early as 2:44 p.m. in New York.

Other parts of the site functioned properly, while the home page remained unreachable, including links to specific pages within the store and its cloud-computing services.

Amazon shares fell 2.7 percent to $265.50 at the close in New York, a day after posting their biggest gain since Oct. 26, following an earnings report that showed a jump in sales and a wider operating margin in North America. The stock jumped 45 percent in 2012.

Last month, Amazon apologized for a disruption at Amazon Web Services, which provides computing power for other companies. While that incident hindered Netflix Inc. customers from watching movies on Dec. 24, it didn’t impact the main shopping site.

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