"Dhruba Bandopadhyay" <dhruba.bandopadh***@hotmail.com> wrote in message
news:%23vVXHb1fGHA.4080@TK2MSFTNGP03.phx.gbl...
> 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.RijndaelManagedTransform.TransformFinalBlock(Byte[]
> inputBuffer, Int32 inputOffset, Int32 inputCount) +1493410
>   System.Security.Cryptography.CryptoStream.FlushFinalBlock() +30
>   System.Web.Configuration.MachineKeySection.EncryptOrDecryptData(Boolean
> fEncrypt, Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Boolean
> useValidationSymAlgo) +154
>   System.Web.Configuration.MachineKeySection.GetDecodedData(Byte[] buf,
> Byte[] modifier, Int32 start, Int32 length, Int32& dataLength) +119
>   System.Web.UI.ObjectStateFormatter.Deserialize(String 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(Exception inner, String
> persistedState, String errorPageMessage, Boolean macValidationError) +116
>   System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +251
>
> 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() +220
>   System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +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(HttpContext context) +18
>   System.Web.UI.Page.ProcessRequest(HttpContext context) +49
>   ASP.record_optimiser_asp_optimiseropen_aspx.ProcessRequest(HttpContext
> context) +29
>
> System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
> +154
>   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&
> completedSynchronously) +64
>
>