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.
The above message is what I get in my ASP.NET 2.0 page. I have debugging
turned on and for those who want to see the stack trace, see below.
In my old web site I had a frame set with a ASP page in left frame and
ASP.NET 2.0 page in right frame. It was working perfectly.
Then I changed the frame set into IFRAMEs (well actually using
floating/draggable/resizable IFRAMEs from http://blogus.xilinus.com/ ). Now
I get the above error message when I try to load up my ASP.NET 2.0 page
within a IFRAME created by http://blogus.xilinus.com/. ASP pages are fine.
Stack Trace:
[CryptographicException: Length of the data to decrypt is invalid.]
System.Security.Cryptography.RijndaelManagedTransf orm.TransformFinalBlock(Byte[]
inputBuffer, Int32 inputOffset, Int32 inputCount) +1493410
System.Security.Cryptography.CryptoStream.FlushFin alBlock() +30
System.Web.Configuration.MachineKeySection.Encrypt OrDecryptData(Boolean
fEncrypt, Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Boolean
useValidationSymAlgo) +154
System.Web.Configuration.MachineKeySection.GetDeco dedData(Byte[] buf,
Byte[] modifier, Int32 start, Int32 length, Int32& dataLength) +119
System.Web.UI.ObjectStateFormatter.Deserialize(Str ing inputString) +214
[ViewStateException: Invalid viewstate.
Client IP: 127.0.0.1
Port: 4945
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET
CLR 1.1.4322; .NET CLR 2.0.50727)
ViewState: /wEPDwULLTEyMTQ2MDU5NjVkZLmM+Cz37HbivYCM/Wp5kXC0U+qx
Referer: http://localhost/main.aspx
Path: /Record/Optimiser/ASP/OptimiserOpen.aspx]
[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.record_optimiser_asp_optimiseropen_aspx.Proces sRequest(HttpContext
context) +29
System.Web.CallHandlerExecutionStep.System.Web.Htt pApplication.IExecutionStep.Execute()
+154
System.Web.HttpApplication.ExecuteStep(IExecutionS tep step, Boolean&
completedSynchronously) +64
