Solution
Turn off the firewall
[root@tz ~]# systemctl stop firewalld [root@tz ~]# setenforce 0
Start agent service
[root@tz ~]# systemctl start zabbix-agent.service [root@tz ~]# systemctl enable zabbix-agent.service
Solution
Turn off the firewall
[root@tz ~]# systemctl stop firewalld [root@tz ~]# setenforce 0
Start agent service
[root@tz ~]# systemctl start zabbix-agent.service [root@tz ~]# systemctl enable zabbix-agent.service