Windows PC Tips and Tricks

Server Error in ‘/’ Application.
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Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.
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 configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

Source Error:

[No relevant source lines]

Source File: App_Web_default.aspx.cdcab7d2.um3t8_ne.0.cs Line: 0

Stack Trace:

[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKeySection.GetDecodedData(Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Int32& dataLength) +2646292
System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +214

[ViewStateException: Invalid viewstate.
Client IP: 65.34.193.236
Port: 4249
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; .NET CLR 1.1.4322)
ViewState: 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...]

[HttpException (0x80004005): Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.]
System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError) +116
System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +251
System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter.Deserialize(String serializedState) +4
System.Web.UI.Util.DeserializeWithAssert(IStateFormatter formatter, String serializedState) +37
System.Web.UI.HiddenFieldPageStatePersister.Load() +220
System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +83
System.Web.UI.Page.LoadAllState() +35
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +6978
System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +213
System.Web.UI.Page.ProcessRequest() +86
System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +18
System.Web.UI.Page.ProcessRequest(HttpContext context) +49
ASP.default_aspx.ProcessRequest(HttpContext context) in App_Web_default.aspx.cdcab7d2.um3t8_ne.0.cs:0
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +303
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +64

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Version Information: Microsoft .NET Framework Version:2.0.50727.832; ASP.NET Version:2.0.50727.832

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