When I click after about 15 minutes on a page I wrote I recieve the
following error:
Server Error in '/' Application.
--------------------------------------------------------------------------------
Validation of viewstate MAC failed. If this application is hosted by a Web
Farm or cluster, ensure that <machineKeyconfiguration 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
<machineKeyconfiguration 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.GetDeco dedData(Byte[] buf,
Byte[] modifier, Int32 start, Int32 length, Int32& dataLength) +2549692
System.Web.UI.ObjectStateFormatter.Deserialize(Str ing inputString) +214
[ViewStateException: Invalid viewstate.
Client IP: 72.81.21.124
Port: 50536
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET
CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30)
ViewState:
/wEPDwULLTE4MzE4MzkwNDgPZBYCAgMPZBYSAgEPDxYCHgRUZXh 0BSVDb21wbGV4IENhc2UgSGlnaGxpZ2h0IChJdGVtcyAx4oCTM TApZGQCBA8PFgIfAAW7A0EgMzUteWVhci1vbGQgQWZyaWNhbi1 BbWVyaWNhbiBtYW4gcHJlc2VudHMgdG8geW91IGZvciBoaXMgY W5udWFsIOKAnHBoeXNpY2FsIGV4YW0u4oCdIEhlIGhhcyBubyB zaWduaWZpY2FudCBjb21wbGFpbnRzIGJ1dCBpcyBjb25jZXJuZ WQgYmVjYXVzZSBoaXMgb2xkZXIgc2lzdGVyIHdhcyBqdXN0IGR pYWdub3NlZCB3aXRoIHR5cGUgMiBkaWFiZXRlcy4gSGlzIGZhd GhlciBhbHNvIGhhZCB0eXBlIDIgZGlhYmV0ZXMgYW5kIGRpZWQ gYXQgYWdlIDU0IG9mIGEgbXlvY2FyZGlhbCBpbmZhcmN0aW9uL iBIZSBoYXMgdHdvIHNvbnMgYWdlIDEwIGFuZCAxMiwgYm90aCA +MTIwJSBvZiBpZGVhbCB3ZWlnaHQgZm9yIHRoZWlyIGhlaWdod C4gSGUgaXMgNuKAmTDigJ0gYW5kIHdlaWdocyAyMTAgbGJzICh CTUkgMjcga2cvbTIpOyBibG9vZCBwcmVzc3VyZSBpcyAxMzgvO DggbW0gSGcuZGQCBw8PFgIfAAU0Q3VycmVudCBsYWIgcmVzdWx 0cyBmb3IgdGhpcyBwYXRpZW50IGFyZSBhcyBmb2xsb3dzOmRkA goPDxYIHghJbWFnZVVybAUSaW1hZ2VzL01...]
[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(Except ion inner, String
persistedState, String errorPageMessage, Boolean macValidationError) +116
System.Web.UI.ObjectStateFormatter.Deserialize(Str ing inputString) +251
System.Web.UI.ObjectStateFormatter.System.Web.UI.I StateFormatter.Deserialize(String
serializedState) +4
System.Web.UI.Util.DeserializeWithAssert(IStateFor matter formatter,
String serializedState) +37
System.Web.UI.HiddenFieldPageStatePersister.Load() +220
System.Web.UI.Page.LoadPageStateFromPersistenceMed ium() +83
System.Web.UI.Page.LoadAllState() +35
System.Web.UI.Page.ProcessRequestMain(Boolean
includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +6953
System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint,
Boolean includeStagesAfterAsyncPoint) +154
System.Web.UI.Page.ProcessRequest() +86
System.Web.UI.Page.ProcessRequestWithNoAssert(Http Context context) +18
System.Web.UI.Page.ProcessRequest(HttpContext context) +49
ASP.default_aspx.ProcessRequest(HttpContext context) +29
System.Web.CallHandlerExecutionStep.System.Web.Htt pApplication.IExecutionStep.Execute()
+154
System.Web.HttpApplication.ExecuteStep(IExecutionS tep step, Boolean&
completedSynchronously) +64
--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET
Version:2.0.50727.210
I have no idea why this happens, and am unfamiliar with viewstate MAC. Can
anyone give me a starting point? Thanks.
--
Nathan Sokalski
nj********@hotmail.com
http://www.nathansokalski.com/
