No connection could be made because the target machine actively refuse

Sujeet Raman

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 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(jsonResponse);
case HttpStatusCode.NotFound:
return QualityCheckResults.CreateAsNotFound();
default:
}
}

19 Replies

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Sujeet Raman5y ago
@Rijwan In which file
+2
Rijwan Ansari5y ago
Sometimes this happens because of proxy as well.

Try this
    "False"/>


Let me know if the application persist the error.
+3
Sujeet Raman5y ago
given same bad request..same port number i am calling through postman and thru httpclient defenitly error will come na
+2
Kiran Mohanty5y ago
Please keep 5001 in both url and startup file
+2
Sujeet Raman5y ago
yes 5001 in startup.cs and 5005 in reqsturl
+2
Kiran Mohanty5y ago
Hope you have updated the port number in StartUp.cs while configuring CORs too !
+2
Sujeet Raman5y ago
i have replaced the code but still bad request returning..my input double checked

i just changed port number to 5001 thats all..
+2
Kiran Mohanty5y ago
what is the port no that your api is hosted ? Is it 2005 or 5001 ? Wrong port number can lead to such error as well.

can you please replace below code with th postman url string ?
public async Task ResultcallHttpclient(Input input)
{
var requestUri ="postman_url";
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(jsonResponse);
case HttpStatusCode.NotFound:
return QualityCheckResults.CreateAsNotFound();
default:
}
}
+2
Sujeet Raman5y ago
Hi kiran

http://mysytem.com:5001 this url i copied from project properties--debug same will be work in postman also.Input also correct
.
+2
Kiran Mohanty5y ago
1. Have you assigned port number as 2005 in project properties ?
2. Are you passing all input parameters to the api action ? (compare with postman request input parameter .
+2
Sujeet Raman5y ago
hi Kiran i followed the same in my startup.cs but still i am getting that issue..below is my stack trace

No connection could be made because the target machine actively refused it.

at System.Net.Http.ConnectHelper.d__1.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Threading.Tasks.ValueTask`1.get_Result()
at System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable`1.ConfiguredValueTaskAwaiter.GetResult()
at System.Net.Http.HttpConnectionPool.d__52.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
at System.Threading.Tasks.ValueTask`1.get_Result()
at System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable`1.ConfiguredValueTaskAwaiter.GetResult()
at System.Net.Http.HttpConnectionPool.d__53.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
at System.Threading.Tasks.ValueTask`1.get_Result()
at System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable`1.ConfiguredValueTaskAwaiter.GetResult()
at System.Net.Http.HttpConnectionPool.d__45.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
at System.Threading.Tasks.ValueTask`1.get_Result()
at System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable`1.ConfiguredValueTaskAwaiter.GetResult()
at System.Net.Http.HttpConnectionPool.d__47.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
at System.Net.Http.RedirectHandler.d__4.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
at System.Net.Http.DiagnosticsHandler.d__2.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
at System.Net.Http.HttpClient.d__70.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at Glapi.Quality.NetCore.Core.ADOCheckerAsync.d__3.MoveNext() in C:\Users\SNU4405\source\repos\Glapi.Quality.NetCore.Api_3.1\Src\Glapi.Quality.NetCore.Core\ADOCheckerAsync.cs:line 58
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at Glapi.Quality.NetCore.Api.Controllers.QualityController.d__7.MoveNext() in C:\Users\SNU4405\source\repos\Glapi.Quality.NetCore.Api_3.1\Src\Glapi.Quality.NetCore.Api\Controllers\QualityController.cs:line 91
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfIActionResultExecutor.d__0.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Threading.Tasks.ValueTask`1.get_Result()
at System.Runtime.CompilerServices.ValueTaskAwaiter`1.GetResult()
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<g__Awaited|12_0>d.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<g__Awaited|10_0>d.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<g__Awaited|13_0>d.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<g__Awaited|25_0>d.MoveNext()

+2
Kiran Mohanty5y ago
your api is hosted in 2005 port. So you should add CORs for the api project (which is hosted in 2005) as below.
services.AddCors(options =>
{
  options.AddPolicy(MyAllowSpecificOrigins,
  builder => {
    builder.WithOrigins("http://localhost:2001") //declaration of 2005 is not required
            .AllowAnyHeader()
            .AllowAnyMethod();
     });
});
+2
Sujeet Raman5y ago
I used http://localhost:2005/api/Product/Productspecific in post man given input obj and i am getting result.

for cors issue i have added below code in startp.cs. I am calling 2005 from 2001 so given this code in 2001

services.AddCors(options =>
{
options.AddPolicy(MyAllowSpecificOrigins,
builder =>
{
builder.WithOrigins("http://localhost:2005",
"http://localhost:2001")
.AllowAnyHeader()
.AllowAnyMethod();
});
});
services.AddControllers();
+2
Kiran Mohanty5y ago
which URL do you use from postman ? If it's http://localhost:2005/api/Product/Productspecific then it's a CORs issue.
+2
Sujeet Raman5y ago
I have the api project in mylocal machine .it is running localy with different port.As its a post request how can i access through browser? I am using postman and its working in post man
+2
Kiran Mohanty5y ago
Do you have the api project in your local machine ? is it hosted or running anywhere ? Can you please try accessing in browser http://localhost:2005/api ?

If you can't access (http://localhost:2005/api/Product/Productspecific) the api URL, no client can consume it as well.
+2
Sachin Singh5y ago
As kiran said , you are simply violating the same origin policy , so you need to enable cors either for all origins or atleast for that to whome you are sending requests.
public void ConfigureServices(IServiceCollection services)
{
    services.AddCors(options =>
    {
        options.AddPolicy(MyAllowSpecificOrigins,
                          builder =>
                          {
                              builder.WithOrigins("http://example.com", //your other api
                                                  "http://www.contoso.com")
                                                  .AllowAnyHeader()
                                                  .AllowAnyMethod();
                          });
    });

    services.AddControllers();
}
+2
Sujeet Raman5y ago
no in browser i cant connect why i dont know

http://localhost:2005/api/Product/Productspecific

This site can’t be reached

localhost refused to connect.
Try:

Checking the connection

Checking the proxy and the firewall

ERR_CONNECTION_REFUSED
+2
Kiran Mohanty5y ago
Hi,
Are you able to access the URL (http://localhost:2005/api/Product/Productspecific ) from your browser ? If Yes, have you enabled CORs on the API ?
+2