I have a server that I can't connect to with zabbix

[akarim]

I have a new server based on Ubuntu 20.04 with IredMail, which I can't connect to.

Client has disable IPV6

I've gone through my installation script, the firewall settings (I even opened it completely)

Nothing worse. I also increased the log system on the client, and nothing.

Zabbix server: 5.0.23
Zabbix client: zabbix_agentd (daemon) (Zabbix) 5.0.24

grep -Ev '^#|^$' /etc/zabbix/zabbix_agentd.conf
PidFile=/var/run/zabbix/zabbix_agentd.pid
LogFile=/var/log/zabbix/zabbix_agentd.log
LogFileSize=0
DebugLevel=3
Server=ZABBIX.SERVER.IPV4
ListenIP=0.0.0.0
StartAgents=3
ServerActive=zABBIX.SERVER.IPV4
Hostname=smtp.domain.tld
Include=/etc/zabbix/zabbix_agentd.d/*.conf

The rest of the configuration in zabbix server is the same as other clients, based on a template that I use in more than 60 vps.



Test via telnet ports 10050 and 10051

root@smtp:~# telnet ZABBIX.SERVER.IPV4 10050
Trying ZABBIX.SERVER.IPV4...
Connected to ZABBIX.SERVER.IPV4
Escape character is '^]'.
Connection closed by foreign host.
root@smtp:~# telnet ZABBIX.SERVER.IPV4 10051
Trying ZABBIX.SERVER.IPV4..
Connected to ZABBIX.SERVER.IPV4
Escape character is '^]'.
^CConnection closed by foreign host.

Log with debug mode enable

196005:20220601:051630.946 zbx_setproctitle() title:'active checks [NODE="1"]Home[/NODE] [idle 1 sec]'
196001:20220601:051631.906 zbx_setproctitle() title:'collector [processing data]'
196001:20220601:051631.907 In update_cpustats()
196001:20220601:051631.907 End of update_cpustats()
196001:20220601:051631.907 zbx_setproctitle() title:'collector [idle 1 sec]'
196005:20220601:051631.946 In send_buffer() host:'51.15.158.217' port:10051 entries:0/100
196005:20220601:051631.946 End of send_buffer():SUCCEED
...