The first of the problems that eventually cascaded into the blackout began at 1 p.m on August 14th. "The inability of critical control data to be exchanged quickly across the grid could have hampered the operators' ability to prevent the cascading effect of the blackout," said Gary Seifert, of DOE's Idaho National Engineering and Environmental Laboratory. "It didn't affect the [control] systems internally, but it most certainly affected the timeliness of the data they were receiving from other networks. A former Bush administration adviser who has consulted with the U.S. Department of Homeland Security on the power grid issue said the Blaster worm also hampered the ability of utilities in the New York region to restore power in a more timely manner because some of those companies were running Windows-based control systems with Port 135 open. The control systems
... are often based on Windows 2000 or XP operating systems and rely on commercial data links, including the Internet and wireless systems, for exchanging information.
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