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How do I know which ports an application opens

Sting

2004-01-23, 5:07 pm

Hello,
I ran a unix application ; I want to know which ports
these application opens.
(This application simply opens sockets with 2 or 3 ports).

How can I do it ?

I of course can do it indirectly.
For example, run nmap before starting the application and
after starting it , and see the difference in ports.
but is there a direct way ?
regards,
sting