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Traffic on the Internet slowed dramatically for hours early Saturday, the effects of a fast-spreading, virus-like infection that overwhelmed the world's digital pipelines and broadly interfered with Web browsing and delivery of e-mail.
The virus-like attack, which began about 12:30 a.m. EST, sought out vulnerable computers on the Internet to infect using a known flaw in popular database software from Microsoft Corp., called "SQL Server 2000." But the attacking software was scanning for victim computers so randomly and so aggressively sending out thousands of probes a second that it saturated many Internet data pipelines.
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