Getting status code 0 and a task was cancelled response getting from web API response

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C#

API

I am facing issue while consuming restful service POST method. It is showing Status code 0, but while am trying to give same request from POSTMAN rest client (A google chrome extension) it works fine. below is the code am using to post some data.

var request = new RestRequest() { Method = Method.Post };
request.Timeout = 30000000;
request.AddBody(body);
var client = new RestClient(new RestClientOptions(url) { Authenticator = httpauth,MaxTimeout = 3000 });
RestResponse restResponse = client.Execute(request);

I am facing the below error message

at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at RestSharp.RestClient.<ExecuteRequestAsync>d__3.MoveNext()

Could you please me to fix this issue.

What I have tried:

I have tried different ways like Timeout and other options also tried.