Cannot invoke Grah Api to send email from Windows Server 2019

Question

Hi,

I created a Console POC application in Windows 10 with .Net Framework 4.7.2.

I am using latest version of Microsoft.Identity.Client and Microsoft Graph.

I am Using IConfidentialClientApplication and ClientSecret for authentication.

I am getting token.

and using MSGraphClient to send email.

In my Windows 10 machine i can send email.

The same console application when I run in Windows Server 2019 I am getting below error.

*   at Microsoft.Graph.HttpProvider.<SendRequestAsync>d__19.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Graph.HttpProvider.<SendAsync>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Graph.BaseRequest.<SendRequestAsync>d__40.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Graph.BaseRequest.<SendAsync>d__33.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at GraphAPIConnect.Program.<SendMail>d__2.MoveNext()
**An error occurred while sending the request.
**   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Graph.RedirectHandler.<SendAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Graph.RetryHandler.<SendAsync>d__9.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Graph.CompressionHandler.<SendAsync>d__2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Graph.AuthenticationHandler.<SendAsync>d__16.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   
***Error 12030 calling WINHTTP_CALLBACK_STATUS_REQUEST_ERROR, 'The connection with the server was terminated abnormally'.
***   at System.Threading.Tasks.RendezvousAwaitable`1.GetResult()
   at System.Net.Http.WinHttpHandler.<StartRequestAsync>d__122.MoveNext()
One or more errors occurred.

It seems request is failing in System.Net.Http.HttpHandler class it self.

So no http request is generating and cannot see in fiddler.

Even I set in code tls1.2 still getting same error,

Could you please help on this.

Regards

Jayprakash Dubey

Answer 1

This issue resolved once we set a proxy server in 2019 windows server

Answer 2

Hi. Thank you for your question and reaching out. I’d be more than happy to help you with your query

In order to use the Microsoft Graph API to send email from Windows Server 2019, you need to first obtain an access token from the Microsoft identity platform. You can then use the access token to call the Graph API and send emails. You can find detailed instructions on how to obtain an access token in the Microsoft Graph API documentation. Additionally, you can also find detailed instructions on how to use the Graph API to send emails in the same documentation.

If the reply was helpful, please don’t forget to upvote or accept as answer, thank you.