Web API: Error when calling responseTask.Wait() after GetAsync in ActionResult

Question

I am following a Web API tutorial, everything has been fine, but I am getting an 'SocketException: An existing connection was forcibly closed by the remote host' exception in the responseTask.Wait() call.

public class StudentController : Controller
{
    public ActionResult Index()
    {
        IEnumerable<StudentViewModel> students = null;

        using (var client = new HttpClient())
        {
            client.BaseAddress = new Uri("http://localhost:64189/api/");
            var responseTask = client.GetAsync("student");
            responseTask.Wait();

            var result = responseTask.Result;
            if (result.IsSuccessStatusCode)
            {
                var readTask = result.Content.ReadAsAsync<IList<StudentViewModel>>();
                readTask.Wait();

                students = readTask.Result;
            }
            else 
            {
                students = Enumerable.Empty<StudentViewModel>();

                ModelState.AddModelError(string.Empty, "Server error. Please contact administrator.");
            }
        }
        return View(students);
    }
}

I already add a ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 but it didn't solve anything.

I tested the API itself https://localhost:12345/api/student and the service is Ok. It's in the responseTask.Wait method where it fails.