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How can I open a particular port on my machine for torrent download and how can I know which all port are open ?

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This question should be asked over at superuser.com. This is off topic in this community. However running "netstat -na" will tell you which ports you have open. What port you need to open is all up to what service you want to make work + if you are behind NAT and so on. – Chris Andrè Dale Feb 9 '12 at 7:49

closed as off topic by Chris Andrè Dale, Rory Alsop♦ Feb 9 '12 at 11:12

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To be as general as the question posed, the answer is yes. Starting a built-in service such as Terminal Services on Windows XP that advertises a port will open the port the service advertises (TS is 3389)...stopping the service will close connections to that port since nothing's listening on the other end. If you would like to be more specific I'll try to give you more specific answers.

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