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Free your blocked ports on Linux

/ 1 min read

This can be frustrating sometimes that you closed all your code editors and terminals but your ports are still blocked.

The only solution you would have in your mind as a beginner is, to restart the computer. But what if there is a better way?

For example, my blocked port is 3000, and I would like to see which application is still using it. I would simply run this in my terminal:

Terminal window
lsof -i :3000

This would give an output with a table of all the programs using this port 3000. Notice the PID column there and note down its value. In my case, it was 6595.

Now run the following command to kill the process and free the port:

Terminal window
kill 6595

That is all!