Problem: Zabbix agent on pol-hyperv is unreachable for 5 minutes

[Marvino]

Hello!
When i enable email notifications then sent often this email but service actually works. Zabbix version is 4.0.18 and agent version is 4.2.4. When I tried update zabbix to 4.2.8 or 4.4.7 then zabbix server can't start. error is in attachments.

[tim.mooney]

Re-run the systemctl status command, but with the "-l" argument to give more information:

systemctl status -l zabbix-server.service

Also, are there any error messages in the zabbix_server.log file?

Finally, if you're going to upgrade, you're better off upgrading to 4.4.7 rather than 4.2.8. The 4.2.x series is no longer being developed, so you either want to be running the 4.0.x LTS series (4.0.18 should be fine) or you want to be running the 4.4.x series (such as 4.4.7). Also, it's generally not recommended to run an agent that's newer than the server (4.2.4 > 4.0.18). In this case, it's probably not an issue, but I recommend avoiding it if possible.