Attacks Threaten Computer Networks as Students Arrive for the Fall Semester

Days after the debut of the e-mail virus known as Sobig.F, college-network administrators were still working overtime to shore up their defenses against it and two fast-spreading Internet worms. The administrators said the attacks on their systems couldn't have come at a worse time.

With students arriving for the fall semester, most colleges have not yet tallied up the cost of dealing with Sobig.F and the two worms, called Blaster and Nachi. But the cleanup expenses are certain to be a

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