Zabbix Agent no active checks on server

[ahmedsobeeh]

i installed zabbix_server (Zabbix) 5.0.5 on centos 8
everything is working fine
but the agents cannot register on the server

telnet from host to Zabbix server is ok
telnet from server to host is ok

I have 4 servers with the same issue
configuration...

[mobileum]

Good morning everybody, i have a problem with a few servers im trying to monitor and its driving me crazy. I added 5 new servers today, all within a private network (10.100.100.6 ... 10.100.100.11), and only one's working. All those servers have the same config, all active checks, and still, 5 of them...

[zabbixfk]

Hi All,

I am trying to setup zabbix server and agent on same server. But getting error in logs saying "host not found" on logs, and on GUI it says, "Zabbix Server is not running, Information Displayed may not be correct"

 20081:20130604:113906.364 cannot

...