Find which process is running on a certain port and kill it

MacOS only

List all the processes by ports with their PIDs

sudo lsof -i -P | grep LISTEN

The result should look like this:

rapportd    123            leo    5u  IPv4 0x84512a8572c9xxxx      0t0    TCP *:62003 (LISTEN)
rapportd    123            leo    6u  IPv6 0x84512a857627xxxx      0t0    TCP *:62003 (LISTEN)
mongod      414            leo    9u  IPv4 0x84512a857926xxxx      0t0    TCP localhost:27017 (LISTEN)
Loom       3315            leo   28u  IPv4 0x84512a85785cxxxx      0t0    TCP localhost:11223 (LISTEN)
node      38238            leo   22u  IPv6 0x84512a857627xxxx      0t0    TCP *:5000 (LISTEN)
node      68336            leo   22u  IPv6 0x84512a858bb4xxxx      0t0    TCP *:443 (LISTEN)

The 2nd column is the PID of the process on the port in the last column

Now kill the process in that port by using sudo kill -9 <PID>

sudo kill -9 68336

68336 is the PID of the process running on port 443

Check again

$ sudo lsof -i -P | grep LISTEN
 
rapportd    123            leo    5u  IPv4 0x84512a8572c9xxxx      0t0    TCP *:62003 (LISTEN)
rapportd    123            leo    6u  IPv6 0x84512a857627xxxx      0t0    TCP *:62003 (LISTEN)
mongod      414            leo    9u  IPv4 0x84512a857926xxxx      0t0    TCP localhost:27017 (LISTEN)
Loom       3315            leo   28u  IPv4 0x84512a85785cxxxx      0t0    TCP localhost:11223 (LISTEN)
node      38238            leo   22u  IPv6 0x84512a857627xxxx      0t0    TCP *:5000 (LISTEN)

The process on port 443 is already stopped!

Cheers