Free your blocked ports on Linux
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. That would definitely fix this.
But what if there is a better way?
What if I can check where my port is being used and close that application, rather than restarting the computer?
For example, my blocked port is 3005 and I would like to see which application is still using it. I would simply run this in my terminal-
lsof -i :3005
This would give an output with a table of all the programs using this port 3005. 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 from this evil app-
Now run your project on that port and live happily ever after.
This is not a very frequent problem but can be frustrating for beginners and developers who are not proficient in Linux.
If you were interested in finding all the ports actively used on your machine
You can use this:
sudo lsof -i | grep LISTEN
I set it up as an alias in my
.bash_profile because I have had to use this more than once.
alias openPorts="sudo lsof -i | grep LISTEN"
So now in my terminal, I just type
openPorts and it displays all the active ports being used
spotify 23576 corey 101u IPv4 5641 0t0 TCP *:54063 (LISTEN) node 23594 corey 59u IPv4 4541 0t0 TCP *:3000 (LISTEN)