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We are encountering the following error frequently in our application.

Problem Id:

System.NullReferenceException at Sitecore.SessionProvider.Redis.StackExchangeClientConnectionAsync+<EvalAsync>d__22.MoveNext

Message: Object reference not set to an instance of an object.

Exception type: System.NullReferenceException

Failed method:

Sitecore.SessionProvider.Redis.StackExchangeClientConnectionAsync+<EvalAsync>d__22.MoveNext

Call Stack:

System.NullReferenceException:
   at System.Object.GetType (mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089)
   at Sitecore.SessionProvider.Redis.StackExchangeClientConnectionAsync+<EvalAsync>d__22.MoveNext (Sitecore.SessionProvider.Redis, Version=17.0.0.0, Culture=neutral, PublicKeyToken=null)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089)
   at Sitecore.SessionProvider.Redis.RedisSessionStateProviderAsync+<SetAndReleaseItemExclusiveAsync>d__20.MoveNext (Sitecore.SessionProvider.Redis, Version=17.0.0.0, Culture=neutral, PublicKeyToken=null)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089)
   at Microsoft.AspNet.SessionState.SessionStateModuleAsync+<ReleaseStateAsyncImpl>d__80.MoveNext (Microsoft.AspNet.SessionState.SessionStateModule, Version=1.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089)
   at Microsoft.AspNet.SessionState.TaskAsyncHelper.EndTask (Microsoft.AspNet.SessionState.SessionStateModule, Version=1.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Web.HttpApplication+AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute (System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a)
   at System.Web.HttpApplication.ExecuteStepImpl (System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a)
   at System.Web.HttpApplication.ExecuteStep (System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a)

The application is deployed on Sitecore Managed Cloud Service Azure PaaS and uses Redis app service.

Sitecore Version: 10.2

StackExchange.Redis DLL version: enter image description here

I have followed the below links as well:

Sitecore PAAS Redis Exception

Azure Web App Redis timeout exceptions when under load

Any help, please?

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1 Answer 1

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After investigation and Google, we have found that our web.config contains the following settings:

enter image description here

Based on this information we can confirm that the reported behavior is a registered bug.

To track the future status of this bug report, please use reference number 505522.

To workaround this issue, we consider setting aspnet:AllowConcurrentRequestsPerSession to false.

Please note: that it is also not recommended to enable aspnet:AllowConcurrentRequestsPerSession according to Sitecore doc as it might cause unexpected behavior such as data loss. For more information please refer to this documentation: Walkthrough: Configuring a private session state database using the Redis provider

However, if you wish to keep aspnet:AllowConcurrentRequestsPerSession enable, you could consider an upgrade to XP 10.3 as this bug is fully resolved in that version.

For more details see the blog post: Sitecore.SessionProvider.Redis.StackExchangeClientConnectionAsync

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