Validation of viewstate MAC failed.

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6/19/2007 6:37:29 AM

DaleEMoore

Total Posts 112

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Validation of viewstate MAC failed.

Hi All,

I wrote my own module where a pushbutton changes a label to "Hello " + date+time, and another pushbutton changes it to "Label " + date+time. Also there are two asp:gridviews displaying information selected from msSQL tables. When I push one button and wait 4 seconds and push the other button everything works fine. But, when I push each button without waiting so long between button pushes, I get the following error in Data/currentlog.config.

2007-06-19 06:22:09,819 [7500] ERROR mojoPortal.Web.Global [(null)] - 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. ---> System.Web.UI.ViewStateException: Invalid viewstate.
Client IP: 75.38.55.178
Port: 64045
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.4) Gecko/20061201 Firefox/2.0.0.4 (Ubuntu-feisty)
ViewState: 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... ---> System.Web.HttpException: Unable to validate data.
at System.Web.Configuration.MachineKeySection.GetDecodedData(Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Int32& dataLength)
at System.Web.UI.ObjectStateFormatter.Deserialize(String inputString)
--- End of inner exception stack trace ---
--- End of inner exception stack trace ---
at System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError)
at System.Web.UI.ObjectStateFormatter.Deserialize(String inputString)
at System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter.Deserialize(String serializedState)
at System.Web.UI.Util.DeserializeWithAssert(IStateFormatter formatter, String serializedState)
at System.Web.UI.HiddenFieldPageStatePersister.Load()
at System.Web.UI.Page.LoadPageStateFromPersistenceMedium()
at System.Web.UI.Page.LoadAllState()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.ProcessRequest()
at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context)
at System.Web.UI.Page.ProcessRequest(HttpContext context)
at ASP.default_aspx.ProcessRequest(HttpContext context) in c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\cms\dfe05af0\fefca3e4\App_Web_7rac0qjv.10.cs:line 0
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Many thanks for any help you can provide,
Dale E. Moore

6/20/2007 4:02:45 PM

Joe Audette

Total Posts 18439

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Re: Validation of viewstate MAC failed.

Hi Dale,

This is not a mojoPortal bug is it? This question would be better in the developer forum.

I would suggest some google research as I know of several things that can cause this. in your case it sounds like double postback, that is clicking the second button before it has completed processing the first postback. You might try disabling the buttons using javascript after the first button is pushed and then re-enable it after processing the postback.

Hope it helps,

Joe

6/20/2007 4:51:46 PM

DaleEMoore

Total Posts 112

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Re: Validation of viewstate MAC failed.

Thanks Joe! I've continued this thread here a more appropriate place. Dale E. Moore

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