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Last active April 5, 2024 15:04
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Closing a port
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closingPort.md

How to close a port on Mac

In Terminal, type the following command to find the process ID (PID) of the port. Replace PORT_NUMBER with the actual port number you want to close.

sudo lsof -i :PORT_NUMBER

Copy the PID number, then use the following command to kill the process using the PID you found.

sudo kill PID_NUMBER

To verify that the port has been closed, you can try to connect to the port.

nc localhost PORT_NUMBER

If it returns immediately without any output, the port is closed. If it retruns some input, try killing it with:

sudo kill -9 PID_NUMBER
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