PSQLException: The server does not support SSL

JDBC driver build number: 42
Server version: 9.2
Exact error message and stacktrace: attached

My system runs for 2h and then this exceptions starts and keep happens
until I restart the system.

This happens when I getting a connection from the HikariCP Pool:

public Connection getConnection() throws SQLException
{
return ds.getConnection();
}

I am using this configuration:

ds = new HikariDataSource();
ds.setMaximumPoolSize(poolSize);
ds.setLeakDetectionThreshold(15000);
ds.setDataSourceClassName("org.postgresql.ds.PGSimpleDataSource");
ds.addDataSourceProperty("serverName", serverAddress);
ds.addDataSourceProperty("databaseName", database);
ds.addDataSourceProperty("user", user);
ds.addDataSourceProperty("portNumber", port);
ds.addDataSourceProperty("password", password);