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The First Step
October 7, 2019
Question

Webhook subscription error C#

Hello,

I am getting an error on my webhook subscription.,

sub-521 WebHook is not reachable, even though I can see that the webhook is being invoked because it hits the breakpoint inside the if statement shown in attached; see error below that. I get a Status 200 Ok response when I invoke the webhook from PowerShell or Postman. I am using ASP.NET/C#. I've also included the subscription code. Thank you for your help.

    3 replies

    PhongVu
    Community Manager
    Community Manager
    October 7, 2019

    The message "Webhook is not reachable" could meant the validateToken was not returned in time or not returned at all.

    Did you follow the instructions exactly shown in this quick start? If not, try that.

    You highlighted the error on line 45. If that is true, what is the error details?

    The First Step
    October 7, 2019

    It works when I create the webhook project from the command line (dotnet new web). I am only seeing that error when I create the web project in Visual Studio (empty template).

    New Participant
    February 22, 2021

    Hello, I found the same problem , the solution for me was put the StreamReader in a Task.Run and use await for waiting the reader.