No connection could be made because the target machine actively refuse

Question

I have two asp.net core 3.1 api solution . I am trying to call port number 2005 from port number 2001 using http client

 

public const string _callurl = "http://localhost:2005/api/Product/Productspecific";

 

.i am getting exception like No connection could be made because the target machine actively refuse what will be the issue?

public async Task<Resultclass> ResultcallHttpclient(Input input)
{
var requestUri = string.Format(UrlPatterns._callurl, _Uri);
StringContent content = new StringContent(JsonConvert.SerializeObject(input), Encoding.UTF8, "application/json");
var httpResponse = await _singleton.Client.PostAsync(requestUri,content);
switch (httpResponse.StatusCode)
{
case HttpStatusCode.OK:
var jsonResponse = await httpResponse.Content.ReadAsStringAsync();
return JsonConvert.DeserializeObject<Resultclass>(jsonResponse);
case HttpStatusCode.NotFound:
return QualityCheckResults.CreateAsNotFound();
default:
}
}