No connection between Zabbix server and agent

[TapioKoistinen]

We are getting error message -> active check configuration update from [192.168.92.8:10051] started to fail (cannot connect to [[192.168.92.8]:10051]: [4] Interrupted system call)

System has following versions

OPNSense os-zabbix agent

OPNsense 20.1.9-amd64
FreeBSD 11.2-RELEASE-p20-HBSD
OpenSSL 1.1.1g 21 Apr 2020

and Zabbix server is 5.0.2

What could cause connection problem?

[LenR]

Network or firewall blocks are the usual problem. On the server, issue: netstat -an | grep 10051, ensure that it shows as LISTEN on *.* or your desired nic. Install nmap or similar tool on the agent, then from the agent: nmap -P0 -p 10051 192.268.92.8

These ensure that the server is listening on 10051 and that the client system can see that port, not using any Zabbix parts.

Also selinux.....

[Singularity]

Can you connect from zabbix server to zabbix agent using telnet <zabbix_agent_host_ip> <zabbix_agent_port>. If yes, make sure that ActiveServer value in zabbix_agentd.conf file is set to zabbix_server_ip.