how to open a port on ubuntu code example

Example 1: ubuntu open port

sudo ufw allow 1191/tcp

Example 2: how to stop running port in ubuntu

sudo kill -9 `sudo lsof -t -i:{PORT_NUMBER}`

Example 3: open firewall port in linux

Debian: sudo ufw allow PORT. CentOS: sudo firewall-cmd --zone=public --permanent --add-port=PORT/tcp sudo firewall-cmd --reload