I have a couple of applications deployed with parseplaform. The applications are worked until yesterday but from today I have received that systems do not work. After spending sometimes it seems Heroku not accepting requests from the parse app.

Parse server cloud function apps are deployed with Heroku which enabled ACM(Automatic certification management) which is currently TLS v1.2. The domain name, for example, https://my-app.herokuapp.com/parse.

Also, my CMS app is deployed with Appharbor which is written in C# .net framework. This is also using the TLS v1.2 certification.

I have found that Heroku is no longer accepting TLS v.1.0/1.1. After that change only these apps has been stopped working.

In my CMS application, I have mentioned server as follow:

<add key="ParseServer" value="https://my-app.herokuapp.com/parse/" />

It is not working but when changing it to HTTP like the following it starts working:

<add key="ParseServer" value="http://my-app.herokuapp.com/parse/" />

When trying a request from CMS, for example when login like follows:

var parseUser = await ParseUser.LogInAsync(username, password);

it produces an error following:

System.NullReferenceException: 'Object reference not set to an instance of an object.'

Stacktrace:

at Parse.Internal.HttpClient.<>c__DisplayClass16.<ExecuteAsync>b__d(Task`1 t)
   at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
   at System.Threading.Tasks.Task.Execute()
   at Parse.Internal.InternalExtensions.<>c__DisplayClass7`1.<OnSuccess>b__6(Task t)
   at System.Threading.Tasks.ContinuationResultTaskFromTask`1.InnerInvoke()
   at System.Threading.Tasks.Task.Execute()
   at Parse.Internal.InternalExtensions.<>c__DisplayClass7`1.<OnSuccess>b__6(Task t)
   at System.Threading.Tasks.ContinuationResultTaskFromTask`1.InnerInvoke()
   at System.Threading.Tasks.Task.Execute()
   at Parse.Internal.InternalExtensions.<>c__DisplayClass7`1.<OnSuccess>b__6(Task t)
   at System.Threading.Tasks.ContinuationResultTaskFromTask`1.InnerInvoke()
   at System.Threading.Tasks.Task.Execute()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Senterapps.Web.Controllers.LoginController.<Index>d__5.MoveNext() in \path\project\Controller.cs:line 555

Is there something I need to check beyond this? What I am doing wrong? Thanks in advance :)