Sometimes a Node packager (Metro for RN, etc) is running and we have no clue where it is running or how to close it.
These commands will rescue you by shutting down those processes.
lsof -i :PORT_NUMBER (of the Node packager)
kill -9 PROCESS_ID (returned above)Example:
-> lsof -i :8081
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
node 33297 rakesharunachalam 26u IPv6 0xc6e6916b616320d5 0t0 TCP *:sunproxyadmin (LISTEN)
node 33297 rakesharunachalam 60u IPv6 0xc6e6916b63417e75 0t0 TCP localhost:sunproxyadmin->localhost:59796 (CLOSED)
node 33297 rakesharunachalam 64u IPv6 0xc6e6916b63418555 0t0 TCP localhost:sunproxyadmin->localhost:59798 (CLOSED)
RNApp 80947 rakesharunachalam 28u IPv6 0xc6e6916b6341a7b5 0t0 TCP localhost:59799->localhost:sunproxyadmin (ESTABLISHED)
RNApp 80947 rakesharunachalam 29u IPv6 0xc6e6916b6341a7b5 0t0 TCP localhost:59799->localhost:sunproxyadmin (ESTABLISHED)
RNApp 80947 rakesharunachalam 32u IPv6 0xc6e6916b63417795 0t0 TCP localhost:59800->localhost:sunproxyadmin (ESTABLISHED)
RNApp 80947 rakesharunachalam 33u IPv6 0xc6e6916b63417795 0t0 TCP localhost:59800->localhost:sunproxyadmin (ESTABLISHED)
-> kill -9 33297
-> kill -9 80947