> How can I do to close some opened ports on my PC.

Find out which application is using the port (ie,
fport) and disable the application.

> And how can I know which port should I have to
close?

Depends on the function of the box.  If you have a web
server running on port 80, and you don't want a web
server running on the box, then disable/uninstall the
software.

Sorry for the rather general response, but you really
haven't provided any detailed information to support
your request.



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