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POASP.Net MVC - Viewstate validation failed on page with no viewstate (or server side controls)
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  1. POASP.Net MVC - Viewstate validation failed on page with no viewstate (or server side controls)
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    copied!<p>An interesting take on an error that's really fustrating. I have a MVC page with no runat=server controls, a single form, and yet I have still recieved a "Validation of viewstate MAC failed" exception on the page, when reading through my error logs.</p> <p>Here is the exception thrown:</p> <pre><code>System.Web.HttpException: Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that &lt;machineKey&gt; configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster. ---&gt; System.Web.UI.ViewStateException: Invalid viewstate. Client IP: 10.XXX.XXX.XXX Port: 33791 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 (.NET CLR 3.5.30729) ViewState: /wEPDwUKMTc2MzIxNTAwOWRkLTq4ngVrnkwCLjQCKKiLdjGVFbs= </code></pre> <p>Here is the complete stack:</p> <pre><code>System.Web.HttpException: Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that &lt;machineKey&gt; configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster. ---&gt; System.Web.UI.ViewStateException: Invalid viewstate. Client IP: 10.XXX.XXX.XXX Port: 33791 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 (.NET CLR 3.5.30729) ViewState: /wEPDwUKMTc2MzIxNTAwOWRkLTq4ngVrnkwCLjQCKKiLdjGVFbs= Referer: http://www.shelfari.com/search/combine?Keywords=turn%20of%20the%20screw Path: /search/Combine ---&gt; System.Web.HttpException: Unable to validate data. at System.Web.Configuration.MachineKeySection.GetDecodedData(Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Int32&amp; 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.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.ProcessRequest(HttpContext context) at ASP.views_search_bookcombined_aspx.ProcessRequest(HttpContext context) at System.Web.Mvc.ViewPage.RenderView(ViewContext viewContext) at System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) at System.Web.Mvc.ControllerActionInvoker.&lt;&gt;c__DisplayClass11.&lt;InvokeActionResultWithFilters&gt;b__e() at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) at System.Web.Mvc.Controller.ExecuteCore() at System.Web.Mvc.MvcHandler.ProcessRequest(HttpContextBase httpContext) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) </code></pre> <p>It's not clear why there would be viewstate on the page at all - I've never been able to reproduce the error, but it occurs occasionally in logs. The users who get the error tend to be individuals trusted &amp; unlikely to be manipulating the viewstate manually.</p> <p>The production environment is a webfarm, with machineKey configuration specified, using the validationKey and validation algorithm across all machines.</p> <p>Any thoughts?</p>
 

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