So all of a sudden, after a week of using it, I get an error message on my zabbix server gui (http://localhost/zabbix/.)
zabbix server
The error says: Zabbix serve
Zabbix serve
Maybe is configuration issue
nano /etc/zabbix/zabbix_server.conf DBHost=localhost DBName=zabbix_db DBUser=zabbix_user DBPassword=XXXXXXX
works for me on Zabbix 3.0 Centos 7