Server Error in '/' Application.

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.

http://go.microsoft.com/fwlink/?LinkID=314055

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.

http://go.microsoft.com/fwlink/?LinkID=314055

Source Error: 


[No relevant source lines]

Source File: c:\Windows\Microsoft.NET\Framework64\v2.0.50727\Temporary ASP.NET Files\root\e6eb278b\4a52d72d\App_Web_pebpzm2g.0.cs    Line: 0

Stack Trace: 


[ViewStateException: Invalid viewstate. 
	Client IP: 177.62.32.16
	Port: 56298
	User-Agent: Mozilla/5.0
	ViewState: 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
	Referer: 
	Path: /Comments.aspx]

[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.

http://go.microsoft.com/fwlink/?LinkID=314055]
   System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError) +190
   System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +11093249
   System.Web.UI.Util.DeserializeWithAssert(IStateFormatter formatter, String serializedState) +59
   System.Web.UI.HiddenFieldPageStatePersister.Load() +11093352
   System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +11178689
   System.Web.UI.Page.LoadAllState() +46
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +11174087
   System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +11173626
   System.Web.UI.Page.ProcessRequest() +91
   System.Web.UI.Page.ProcessRequest(HttpContext context) +240
   ASP.comments_aspx.ProcessRequest(HttpContext context) in c:\Windows\Microsoft.NET\Framework64\v2.0.50727\Temporary ASP.NET Files\root\e6eb278b\4a52d72d\App_Web_pebpzm2g.0.cs:0
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +599
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +171

Version Information: Microsoft .NET Framework Version:2.0.50727.8974; ASP.NET Version:2.0.50727.8974