Some servers may run versions of MySQL that have different SSL requirements/settings, without SSL enabled, if you are running Spigot and get errors with a plugin that is using SSL similar to this:
WARN: Establishing SSL connection without server's identity verification is not recommended.
Then you will need to edit the plugins configuration file where your MySQL database details are entered, and type the following after the database name:
?useSSL=false
Therefore, if your plugin config has the following:
database: mc1234
Change it to:
database: mc1234?useSSL=false
Then restart your server
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