System.Web.HttpException: Invalid_Viewstate

D

dima

Hi All,
I know some of you had this problem in production.
Did anyone find out how to fix this problem or what is the cause of it?

System.Web.HttpException: Invalid_Viewstate

System.Web.HttpException: Authentication of viewstate failed. 1) If
this is a cluster, edit <machineKey> configuration so all servers use
the same validationKey and validation algorithm. AutoGenerate cannot
be used in a cluster. 2) Viewstate can only be posted back to the same
page. 3) The viewstate for this page might be corrupted. --->
System.Web.HttpException: Unable to validate data.
at System.Web.Configuration.MachineKey.GetDecodedData(Byte[] buf,
Byte[] modifier, Int32 start, Int32 length, Int32& dataLength)
at System.Web.UI.LosFormatter.Deserialize(String input)
--- End of inner exception stack trace ---
at System.Web.UI.LosFormatter.Deserialize(String input)
at System.Web.UI.Page.LoadPageStateFromPersistenceMedium()
--- End of inner exception stack trace ---
at System.Web.UI.Page.LoadPageStateFromPersistenceMedium()
at System.Web.UI.Page.LoadPageViewState()
at System.Web.UI.Page.ProcessRequestMain()
 

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