To check if firewalld is running, enter the following command:

~]$ systemctl status firewalld
firewalld.service - firewalld - dynamic firewall daemon
	  Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled)
	  Active: active (running) since Sat 2013-04-06 22:56:59 CEST; 2 days ago
	Main PID: 688 (firewalld)
	  CGroup: name=systemd:/system/firewalld.service

In addition, check if firewall-cmd can connect to the daemon by entering the following command:

~]$ firewall-cmd --state 
running