How to close a port

[Hoang Manh Hung]

Hi everybody,

I start a network program that listen on a specific port (98).
After a while the program fails and I want to restart it.
But it said that it can't bind on that port (98), address already in
use.

How do I know which program opened that port?
How do I close that port to restart my program?

Many thanks,
HungHM.



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