Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. in c# web api

API Q&A
1

I’m unable to get the access token and getting “Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.” error. using the same provided code with .net integration after replacing the key values. please help me to get out.

2

Makes sure you are using Tls1.2, I vaguely remember have to change this a few months ago
public ActionResult Callback(string code)
{
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
if (!string.IsNullOrEmpty(code))
{