How do I close an open port from the terminal on the Mac?

Find out the process ID (PID) which is occupying the port number (e.g., 5955) you would like to free
```
sudo lsof -i :5955
```
Kill the process which is currently using the port using its PID
```
sudo kill -9 PID
```

To find the process try:

sudo lsof -i :portNumber

Kill the process which is currently using the port using its PID

kill PID

and then check to see if the port closed. If not, try:

kill -9 PID

I would only do the following if the previous didnt work

sudo kill -9 PID

Just to be safe. Again depending on how you opened the port, this may not matter.

In 2018 here is what worked for me using MacOS HighSierra:

sudo lsof -nPi :yourPortNumber

then:

sudo kill -9 yourPIDnumber

very simple find port 5900:

sudo lsof -i :5900

then considering 59553 as PID

sudo kill 59553

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