    def test_makepasv_issue43285_security_enabled_default(self):
        self.assertFalse(self.client.trust_server_pasv_ipv4_address)
        trusted_host, port = self.client.makepasv()
        self.assertNotEqual(
                trusted_host, self.server.handler_instance.fake_pasv_server_ip)
        # Opening and closing a connection keeps the dummy server happy
        # instead of timing out on accept.
        socket.create_connection((trusted_host, port), timeout=TIMEOUT).close()