close port code example

Example 1: how to shutdown port in windows

netstat  -ano  |  findstr  < Port Number >
taskkill  /F  /PID  < Process Id >

Example 2: debian kill open port

fuser -k 3000/tcp 	//will kill that process.

Example 3: how to close port in linux

sudo ufw deny PORT

Example 4: how to close port in linux

sudo ufw allow PORT