Db2Connector is unable to establish validation connection

Db2ConnectorConfig connectorConfig = new Db2ConnectorConfig(config);
try (Db2Connection connection = new Db2Connection(connectorConfig.getConfig())) {
    try {
        connection.connect();
        connection.execute("SELECT version()");
        LOGGER.info("Successfully tested connection for {} with user '{}'", connection.connectionString(), connection.username());
    }
    catch (SQLException e) {
        LOGGER.error("Failed testing connection for {} with user '{}'", connection.connectionString(), connection.username(), e);
        hostnameValue.addErrorMessage("Unable to connect: " + e.getMessage());
    }
}