A Milwaukee computer security expert's research has helped discover a potential for serious Internet traffic-flow vulnerabilities. Left unchecked, hackers could disrupt Web surfing, e-mail and other forms of electronic communication. Paul Watson, who works for Rockwell Automation's Information Security Group, has been working with the British government's National Infrastructure Security Coordination Centre. The organization released information Tuesday addressing flaws that could allow hackers to knock computers off-line and disrupt vital traffic-directing devices, called routers, that coordinate the flow of data among distant groups of computers. "It's a vulnerability that everyone has known about but never really talked about," Watson, 35,...