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Finding the process that is using a certain port in Linux

How may I find out which process(daemon) is listening on a given port if I do not have a service that would specifically listen on that port? For example if port 10101 is open how can I close the respective process?

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marked as duplicate by KronoS, Hennes, CharlieRB, BBlake, Tog Jan 8 '13 at 22:28

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2 Answers 2

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You can use lsof (list open files) to get the Process ID.

E.g. lsof | grep 10101

Then use can get the process name from /proc (cd /proc/processIDnumber).

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Yes. A more specific way would be lsof -i :10101 –  Sebi Jan 8 '13 at 18:07
    
Thank. I was struggling with the man page which is somehow messed up on my system. –  Hennes Jan 8 '13 at 18:09

You can do netstat -tulpn and grep for the name of the port.

For instance, using your example port, the command would be netstat -tulpn | grep 10101

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