Http.HttpRequestException to vagrant host

Question

I have REST API server on my vagrant machine. And I write client for it on c# (VS2015).

Have same code:

using (HttpClient client = new HttpClient())
{
    client.BaseAddress = new Uri(_server);
    client.DefaultRequestHeaders.Accept.Clear();
    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

    HttpResponseMessage response = null;

    try
    {
         response = await client.GetAsync(_action);
    }
    catch (HttpRequestException e)
    {
        Debug.WriteLine(e.Message);
    }
}

Trouble:

Exception thrown: 'System.Net.Http.HttpRequestException' in mscorlib.ni.dll An error occurred while sending the request.

If I send request to another (non-vagrant) host, all is OK.

Question: How I can solve this?

Thanks)

UPDATED

Stack trace

Exception thrown: 'System.Net.Http.HttpRequestException' in mscorlib.ni.dll
mess: An error occurred while sending the request.
   at System.Net.Http.HttpClientHandler.<SendAsync>d__1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Uborka.Models.ApiModel.<_Response>d__17.MoveNext()