Explore Courses Blog Tutorials Interview Questions
0 votes
1 view
in Salesforce by (11.9k points)

I have some existing code that was working and all-of-a-sudden quit.

I can't figure out why...

Here is my code:

public static string RequestToken(string u, string pw)


    string result = string.Empty;

    string strUrl = "" + u + "&password=" + pw;

    HttpWebRequest tokenRequest = WebRequest.Create(strUrl) as HttpWebRequest;


    tokenRequest.Method = "POST";



        using (HttpWebResponse tokenResponse = tokenRequest.GetResponse() as HttpWebResponse)


            if (tokenResponse.StatusCode != HttpStatusCode.OK)

                throw new Exception(String.Format(

                    "Server error (HTTP {0}: {1}).",



            DataContractJsonSerializer jsonSerializer2 = new DataContractJsonSerializer(typeof(ResponseAuthentication));

            object objTokenResponse = jsonSerializer2.ReadObject(tokenResponse.GetResponseStream());

            ResponseAuthentication jsonResponseAuthentication = objTokenResponse as ResponseAuthentication;

            result = jsonResponseAuthentication.strAccessToken;



    catch (Exception ex)




    return result;


I am now getting a 500 Internal Server Error where before this was working cleanly.

When I try to debug using Postman, I pass the URL directly and it works fine. Even when I put a stop in the code and use the exact same URL that then fails from inside the code, it works in Postman, but not in C#.

Out of Postman, I get an orderly...


  "access_token": "XXXXXX",

  "instance_url": "",

  "id": "",

  "token_type": "Bearer",

  "issued_at": "XXXXXX",

  "signature": "XXXXXX"


To clarify, I have tried a GET request instead of POST and I receive the following response (in Postman):


  "error": "invalid_request",

  "error_description": "must use HTTP POST"


Any ideas here?

1 Answer

0 votes
by (32.1k points)

Alright, so this turns out .NET 4.6 defaults to using TLS 1.2.

It was a very easy fix. I just added this one line of code and it quickly worked:

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

Hope that helps someone else with the same problem!

Related questions

Welcome to Intellipaat Community. Get your technical queries answered by top developers!

28.4k questions

29.7k answers


94.7k users

Browse Categories