Requesting OAuth token does not work using code but works using Postman

Question

I have tried to make my web API to generate a OAuth web API token using this Article .It worked fine testing it on postman

but when I try to execute using the code that postman provides for the request I get response.Content="" and response.StatusCode=0

     var client = new RestClient("https://ip_address/token");
            client.Timeout = -1;
            var request = new RestRequest(Method.POST);         
            request.AddParameter("grant_type", "password");
            request.AddParameter("username", "Morad.A");
            request.AddParameter("password", "123456");
            IRestResponse response = client.Execute(request);
            Console.WriteLine(response.Content);

What I have tried is adding

    if (ServicePointManager.SecurityProtocol.HasFlag(SecurityProtocolType.Tls12) == false)
            {
                ServicePointManager.SecurityProtocol = ServicePointManager.SecurityProtocol | SecurityProtocolType.Tls12;
            }

to my Application_Start() in my web API

Any suggestions?

Answer 1

Check the authorization type usually, OAuth requires Authoriaztion so you have to add auth value to request header. ie if auth typs is Basic just add the following:

Authorization: Base64(client:secret)