This is a user contributed quick tip.
How do you list the network open ports on your server and the process that owns them? The answer is simple use the following command (must run as root):
sudo lsof -i
sudo netstat -lptu
This article / faq / short tip is contributed by Vikrant Joshi. nixCraft welcomes readers' tips / howtos.
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{ 8 comments… read them below or add one }
Shameless plug to a really good article I wrote about lsof and some of the more nifty tricks:
Troubleshooting running systems with lsof
Thanks Vikrant for the useful tip…I’ve used lsof for ages but sort of taken it for granted,didn’t check the man pages, and wasn’t aware of this option.
Great (!!!) site, by the way, I’ll start contributing my own tips as well. Thanks for giving me lots of ideas-projects to increase my understanding of Linux/BSD.
Thanks
Very useful, thanks
What should I do when netstat lists the PID as “-” and lsof doesn’t list anything for that port? I know something is listening on that port because “nc -z -v -w1 1-65534″ says so.
@paul: did you run the commands as root?
@jeff
Thanks for the reply! Yes, I did run all the commands as root. I ran nc from both a different machine on the network and also the same machine that has the port open.
Any ideas?
Running sudo lsof -i gives me command not found?