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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.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Web.HttpException: 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.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[ViewStateException: Invalid viewstate.
Client IP: 10.9.67.57
Port: 53656
Referer: http://idt_val_vm_srv/Account/Login?ReturnUrl=%2FAccount%2FEnterHours%2F%3Fdate%3D2018-05-01
Path: /Account/Login
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko
ViewState: NLiXWsLtnB/N9glviq6iJpahHR6xrvla7oVYkgXEW5YLbmw0ybMslZZmm3wm8hEhTtfD6CoQGX6STbZ0ZqSrjGSjBZIg+CbZ7yT+zbC2WntSQp4BBFYRnkV0kvIEs9ITyI4bTXQHu5hwYXEmgT7pe9gSxy1VYXtpkt7C50bx5NI4Ka/Tj1oFvjV2cllBDYE0n3HEUo7x003pbI7yQllr3A==]
[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.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError) +153
System.Web.UI.ObjectStateFormatter.Deserialize(String inputString, Purpose purpose) +912
System.Web.UI.Util.DeserializeWithAssert(IStateFormatter2 formatter, String serializedState, Purpose purpose) +61
System.Web.UI.HiddenFieldPageStatePersister.Load() +309
System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +367
System.Web.UI.Page.LoadAllState() +46
System.Web.UI.<ProcessRequestMainAsync>d__523.MoveNext() +13873
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() +31
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
System.Web.Util.WithinCancellableCallbackTaskAwaiter.GetResult() +32
System.Web.UI.<ProcessRequestAsync>d__515.MoveNext() +790
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() +31
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
System.Web.UI.<ProcessRequestAsync>d__554.MoveNext() +616
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() +31
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
System.Web.TaskAsyncHelper.EndTask(IAsyncResult ar) +64
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +607
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +134