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9.3

I get the following error message on the Browser when I run my web application: Validation of viewstate MAC failed???

Asked by salman_sulaiman_2008 in Visual Studio, WebApplications

Tags: Microsoft, Microsoft Visual Studio 2005, 2005, ASP.NET, Microsoft windows Internet Explorer 7, Validation of viewstate MAC failed

Greetings experts!
I am working on a web application, and I am using Masterpages, at a certain point when debugging the application, I get the following error on my browser (I have attached it in code snippet), and I can't figure out what goes wrong, I wish someone could help me with it.

Thanks in advance.
~salman~ 
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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. 
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.
 
Source Error: 
 
The source code that generated this unhandled exception can only be shown when compiled in debug mode. To enable this, please follow one of the below steps, then request the URL:
 
1. Add a "Debug=true" directive at the top of the file that generated the error. Example:
 
  <%@ Page Language="C#" Debug="true" %>
 
or:
 
2) Add the following section to the configuration file of your application:
 
<configuration>
   <system.web>
       <compilation debug="true"/>
   </system.web>
</configuration>
 
Note that this second technique will cause all files within a given application to be compiled in debug mode. The first technique will cause only that particular file to be compiled in debug mode.
 
Important: Running applications in debug mode does incur a memory/performance overhead. You should make sure that an application has debugging disabled before deploying into production scenario.  
 
Stack Trace: 
 
 
[HttpException (0x80004005): Unable to validate data.]
   System.Web.Configuration.MachineKeySection.GetDecodedData(Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Int32& dataLength) +294
   System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +203
 
[ViewStateException: Invalid viewstate. 
	Client IP: 127.0.0.1
	Port: 4609
	User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; InfoPath.2; .NET CLR 3.0.04506.648)
	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 <machineKey> 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) +267
   System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +282
   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() +198
   System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +83
   System.Web.UI.Page.LoadAllState() +35
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +7350
   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.budget_test_budget_availability_aspx.ProcessRequest(HttpContext context) +29
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +358
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +64
 
 
 
 
--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433
[+][-]04/09/08 01:43 AM, ID: 21312875Expert Comment

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[+][-]04/09/08 11:20 AM, ID: 21317591Accepted Solution

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About this solution

Zones: Visual Studio, WebApplications
Tags: Microsoft, Microsoft Visual Studio 2005, 2005, ASP.NET, Microsoft windows Internet Explorer 7, Validation of viewstate MAC failed
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Solution Provided By: steedBmaher
Participating Experts: 2
Solution Grade: A
 
 
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