Getting request time out randomaly while getting access token using MSAL library “confidentialClientApplication.AcquireTokenForClient”

Question

I have a service which communicates with outlook exchange online using EWS. This has OAuth authentication and for that AppID is registered on the Azure portal. I am able to generate access token and communicate with exchange online successfully.

However, randomly in between getting request time out while generating token using MSAL library method "confidentialClientApplication.AcquireTokenForClient".

Please note many call happens to my service from difference places so could it be due to many calls this is failing? I think retry logic is inbuilt with this and in logs also i see similar thing. What is the recommended way to handle this issue?

Access token code

private async Task<string> GetAccessToken()
{
     try
     {
     
         var confidentialClientApplication = ConfidentialClientApplicationBuilder.Create(ExchangeOnlineConfiguration.ClientId)
                                                            .WithTenantId(ExchangeOnlineConfiguration.TenantId)
                                                            .WithClientSecret(ExchangeOnlineConfiguration.ClientSecret)
                                                            .Build();
         var authenticationResult = await confidentialClientApplication.
             AcquireTokenForClient(new[] { ExchangeOnlineConfiguration.DefaultScope }).ExecuteAsync();

         var accessToken = authenticationResult.AccessToken;
         return accessToken;
     }
     catch (Exception ex)
     {
         ContentLogger.logger.Error($"GetAccessToken failed! Exception Details {ex} ");
         throw;
     }
 }

Exception:

GetAccessToken failed! Exception Details MSAL.Desktop.4.14.0.0.MsalServiceException:
ErrorCode: request_timeout
Microsoft.Identity.Client.MsalServiceException: Request to the endpoint timed out. ---> System.Threading.Tasks.TaskCanceledException: A task was canceled.
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Identity.Client.Http.HttpManager.<ExecuteAsync>d_10.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Identity.Client.Http.HttpManager.<ExecuteWithRetryAsync>d8.MoveNext()
--- End of inner exception stack trace ---
at Microsoft.Identity.Client.Http.HttpManager.<ExecuteWithRetryAsync>d8.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Identity.Client.Http.HttpManager.<ExecuteWithRetryAsync>d8.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Identity.Client.Http.HttpManager.<SendPostAsync>d4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Identity.Client.Http.HttpManager.<SendPostAsync>d3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Identity.Client.OAuth2.OAuth2Client.<ExecuteRequestAsync>d11`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Identity.Client.OAuth2.OAuth2Client.<GetTokenAsync>d10.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Identity.Client.OAuth2.TokenClient.<SendHttpAndClearTelemetryAsync>d8.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at Microsoft.Identity.Client.OAuth2.TokenClient.<SendHttpAndClearTelemetryAsync>d8.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Identity.Client.OAuth2.TokenClient.<SendTokenRequestAsync>d5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Identity.Client.Internal.Requests.RequestBase.<SendTokenRequestAsync>d21.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Identity.Client.Internal.Requests.ClientCredentialRequest.<FetchNewAccessTokenAsync>d3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Identity.Client.Internal.Requests.ClientCredentialRequest.<ExecuteAsync>d2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Identity.Client.Internal.Requests.RequestBase.<RunAsync>d14.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Identity.Client.ApiConfig.Executors.ConfidentialClientExecutor.<ExecuteAsync>d3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at GetAccessToken>d_11.MoveNext() in

Chauncy Zhou Chauncy Zhou · Accepted Answer · 2021-04-25T03:29:13

Obtaining multiple tokens asynchronously does not seem to work. One Confidential Client Application for each token cache.

For Client Credentials flow a singleton should work fine. You are requesting tokens for an application, not for a user. There will only be 1 access token in the in-memory cache (for the app), irrespective of how many users and sessions there are

Note that you're not providing a token cache implementation, which means that MSAL will cache tokens in memory (in this case the one access token).

You can refer to this question.

Getting request time out randomaly while getting access token using MSAL library “confidentialClientApplication.AcquireTokenForClient”

1 Answers