Resolution: Commercial support required
zabbix version 4.0.4
I restarted my zabbix server. After couple of time zabbix generated false notification with such a this description: "zabbix agent on 'server' is unreachable for 5 minutes also start time is greater than end time" in most of host names which I had defined. issue has been token place for 3 days although previous notifications are working in the correct format.
before restarting I did below actions I don't think that they are very important.
1- executing "nmap
n -PN -sT -sU -p localhost" for finding all listening ports.
2- changing Database hostname and back it to normal one in less than zero one minute time.
after occurring issue, these are works which I've done:
1- checking timezone in all configs (php.ini, zabbix.config,..) which I know and set them to current time zone.
2- checking logs in Proxy ,Zabbix server, but I didn't find any useful information.
3- check all setting which I implemeted in zabbix installation time however all things were normal.
Could you please support?