Why does the Zabbix agent say "MySQL is down"?

Question

MySQL

There is a server on Ubuntu 20.04 with MariaDB installed on it and the Zabbix agent.
It was required to monitor the state of the database server. Created a zabbix monitoring user, configured everything in .my.cnf
On the MySQL monitoring server is down, although the database is working...

Answer 1

what does the Zabbix agent say on that machine locally?

Answer 2

I would like to help you, so specify the question
1) Attach screenshots of configured items
2) Attach zabbix_agentd.conf
3) UserParameters?
If you do not return a single value item, check the spelling and availability of the port for connecting to the database.
Will mysql.uptime pass?