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I'm doing in Ubuntu 12

alex@ubuntu:~/folder$ lsof -t -i:3000
alex@ubuntu:~/folder$ kill 4469
alex@ubuntu:~/folder$ lsof -t -i:3000

What did I do wrong?

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Welcome to AskUbuntu! You may want to specify Ubuntu 12.04 or 12.10. – Oyibo Oct 31 '12 at 8:52
What is process 4469? Do you have permission to kill it? (try sudo kill 4469). Does that process respond to the signal sent to it? (try sudo kill -9 4469, as signal 9 is required to be acted upon.) – Huckle Oct 31 '12 at 19:25
up vote 2 down vote accepted
kill -9 4469 


 fuser -k -n tcp 3000

3000 is the port number

or Use killport command :

killport 3000 
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