Zabbix server does not discover anything

[amirhz]

Hi,
Recently I installed Zabbix on Ubuntu 20
But I have this error on the front-end side:


Zabbix server is running No localhost:10051

I tried to see the zabbix_server.log file which shows this error repeatedly:

976950:20201023:160455.183 failed...

[Mohs3n]

Hi

We have a Zabbix box with 30 something hosts and a few custom templates. Recently, we receive an error at the bottom of the page that says "Zabbix server is not running: the information displayed may not be correct".
I've searched this error and made few adjustments but...