How to stop all connections to a psql 12 database?

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  ER_NOT_SUPPORTED_AUTH_MODE: Client does not support authentication protocol requested by server; consider upgrading MySQL client

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  Error Code: 1055. Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'mydb.term.year' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

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  Sql doesn't contain

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  Cannot load driver class: com.mysql.cj.jdbc.Driver

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  Postgres left join

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