Server actively refused connection functional test symfony

I'm building an application in Symfony with a sql server running on a vagrant virtual box.

The application works, but I have to write some functional tests. I followed the instructions on the site of Symfony itself but the test fails. In my first test I'm asserting that the response code is 200 but I get a 500 because the server "actively refused the connection". When using postman, or just my browser, the route returns everything that it should.

Here is my test code:

public function testGetMessageList()
{
    $client = static::createClient(array(), array(
        'PHP_AUTH_USER' => 'jonas',
        'PHP_AUTH_PW'   => 'joskebammens',
        'SERVER_PORT' => '8000',
    ));

    $client->request('GET', '/messages');

    //var_dump($client->getResponse());
    var_dump($client->getRequest());
    $this->assertEquals(200, $client->getResponse()->getStatusCode());
}

The var_dump of the request shows me, among other variables, this:

public $server =>
class Symfony\Component\HttpFoundation\ServerBag#128 (1) {
protected $parameters =>
array(19) {
  'SERVER_NAME' =>
  string(9) "localhost"
  'SERVER_PORT' =>
  int(80)
  'HTTP_HOST' =>
  string(9) "localhost"
  'HTTP_USER_AGENT' =>
  string(18) "Symfony BrowserKit"
  'HTTP_ACCEPT' =>
  string(63) "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
  'HTTP_ACCEPT_LANGUAGE' =>
  string(14) "en-us,en;q=0.5"
  'HTTP_ACCEPT_CHARSET' =>
  string(30) "ISO-8859-1,utf-8;q=0.7,*;q=0.7"
  'REMOTE_ADDR' =>
  string(9) "127.0.0.1"
  'SCRIPT_NAME' =>
  string(0) ""
  'SCRIPT_FILENAME' =>
  string(0) ""
  'SERVER_PROTOCOL' =>
  string(8) "HTTP/1.1"
  'REQUEST_TIME' =>
  int(1541148564)
  'PHP_AUTH_USER' =>
  string(5) "jonas"
  'PHP_AUTH_PW' =>
  string(12) "joskebammens"
  [0] =>
  string(0) ""
  'PATH_INFO' =>
  string(0) ""
  'REQUEST_METHOD' =>
  string(3) "GET"
  'REQUEST_URI' =>
  string(9) "/messages"
  'QUERY_STRING' =>
  string(0) ""
}
}

I can't seem to change any variables other than the authentication ones. My vagrant is on 192.168.33.22, sql on port 3306. And my php server is on localhost:8000.

Does anyone know what I could do or what I am doing wrong?

Thanks