Forum Error

System.Web.HttpException (0x80004005): Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

See http://go.microsoft.com/fwlink/?LinkID=314055 for more information. ---> System.Web.UI.ViewStateException: Invalid viewstate. 
	Client IP: 147.243.51.112
	Port: 40474
	Referer: https://forum.justyou.co.uk/
	Path: /Default.aspx
	User-Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36
	ViewState: 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...
   at System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError)
   at System.Web.UI.ObjectStateFormatter.Deserialize(String inputString, Purpose purpose)
   at System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter2.Deserialize(String serializedState, Purpose purpose)
   at System.Web.UI.Util.DeserializeWithAssert(IStateFormatter2 formatter, String serializedState, Purpose purpose)
   at System.Web.UI.HiddenFieldPageStatePersister.Load()
   at System.Web.UI.Page.LoadPageStateFromPersistenceMedium()
   at System.Web.UI.Page.LoadAllState()
   at System.Web.UI.Page.<ProcessRequestMainAsync>d__523.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.Web.Util.WithinCancellableCallbackTaskAwaitable.WithinCancellableCallbackTaskAwaiter.GetResult()
   at System.Web.UI.Page.<ProcessRequestAsync>d__515.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.Web.UI.Page.<ProcessRequestAsync>d__554.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.Web.TaskAsyncHelper.EndTask(IAsyncResult ar)
   at System.Web.UI.Page.AsyncPageEndProcessRequest(IAsyncResult result)
   at ASP.default_aspx.EndProcessRequest(IAsyncResult ar)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.<>c__DisplayClass285_0.<ExecuteStepImpl>b__0()
   at System.Web.HttpApplication.StepInvoker.Invoke(Action executionStep)
   at System.Web.HttpApplication.StepInvoker.<>c__DisplayClass4_0.<Invoke>b__0()
   at Microsoft.AspNet.TelemetryCorrelation.TelemetryCorrelationHttpModule.OnExecuteRequestStep(HttpContextBase context, Action step)
   at System.Web.HttpApplication.<>c__DisplayClass284_0.<OnExecuteRequestStep>b__0(Action nextStepAction)
   at System.Web.HttpApplication.StepInvoker.Invoke(Action executionStep)
   at System.Web.HttpApplication.StepInvoker.<>c__DisplayClass4_0.<Invoke>b__0()
   at Microsoft.ApplicationInsights.Web.ApplicationInsightsHttpModule.OnExecuteRequestStep(HttpContextBase context, Action step)
   at System.Web.HttpApplication.<>c__DisplayClass284_0.<OnExecuteRequestStep>b__0(Action nextStepAction)
   at System.Web.HttpApplication.StepInvoker.Invoke(Action executionStep)
   at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)