Fedora turn off firewall

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If you are using Fedora >= 18, the server is probably running firewalld, which you can disable by running systemctl stop firewalld.service as root. You might also want to read man firewall-cmd to find out more about adding firewall rules. If you are running an older version of Fedora (or one that has been upgraded from an older version), the server is probably running iptables, which you can turn of by running systemctl stop iptables.service (using systemctl assumes you are running Fedora >= 15, with systemd as init deamon).