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Windows XP Service Pack 2 (available here) includes an array of new security “enhancements”. One of these so called enhancements limits the number of simultaneous incomplete outbound TCP connection attempts (’half-open connections’) per second to 10. This is supposed to slow down certain viruses because their spreading strategy is to try to connect to a high amount of random IP numbers. While this limit will slow down viruses, it will also slow P2P (peer-to-peer) applications that establish lots of connections over a short period of time. BitComet is one such application.
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