Firewalld

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Firewalld

  • Stop iptables if in use: sudo systemctl stop iptables
  • Make sure iptables are not used by your system anymore: sudo systemctl mask iptables
  • Check its status: sudo systemctl status iptables
  • Remove UFW if installed: Create PDF in your applications with the Pdfcrowd HTML to PDF API
  • Is there a Firewall for Ubuntu which doesn't need to be turned on at every reboot like
  • Gufw PDFCROWD

sudo apt-get remove ufw
Firewalld - Dynamic Firewall Manager
1. Install firewalld :
sudo apt install firewalld
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2. Check its status:
sudo systemctl status firewalld
3. Enable or disable firewalld:
sudo systemctl [enable | disable ] firewalld
4. Starting and stoping it:
sudo systemctl [ start | stop ] firewalld
So to use it is simply to enable it as in steps 2, then use the man pages to get more information.
See here for more information on how to use firewalld