Why can't I connect to MySQL 8.0 database?

[JConstantine]

When I'm trying to connect to MySQL 8.0 database I get this error in Jira Configuration Tool:

Attempting to connect to the MySQL 5.7+ database server...
Could not connect to the DB: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

What might be the problem here?

[Nic Brough -Adaptavist-]

Your database is not running on the server you are trying to connect to, or there is a network problem between your Jira server and the database server.

[JConstantine]

The database is running. I can connect to my server on localhost, but now I'm trying to connect to the server that's located on the other machine of the domain.

[Nic Brough -Adaptavist-]

So there is a networking issue.  Check that you're not firewalling it off, and that the server is configured to allow connections from the remote machine.

[JConstantine]

Looks like the I have the old version of MySQL Connector. It's mysql-connector-java-5.1.48-bin.jar.  I'll try updating it.