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Server Error in '/klpoz/cz' Application.
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.
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 <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[ViewStateException: Invalid viewstate.
Client IP: ...
Port: ...
Referer: http://web.upc.cz/klpoz/cz/ContactForm.aspx?problemId=17
Path: /klpoz/cz/ContactForm.aspx
User-Agent: Mozilla/5.0 (X11; Linux i686; rv:10.0.5) Gecko/20100101 Firefox/10.0.5 Iceweasel/10.0.5
ViewState: ...
[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.ThrowMacValidationError(Exception inner, String persistedState) +11364542
System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +11364977
System.Web.UI.Util.DeserializeWithAssert(IStateFormatter formatter, String serializedState) +60
System.Web.UI.HiddenFieldPageStatePersister.Load() +11365255
System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +11445367
System.Web.UI.Page.LoadAllState() +56
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +11439394
System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +11438910
System.Web.UI.Page.ProcessRequest() +269
System.Web.UI.Page.ProcessRequest(HttpContext context) +167
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +625
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +270
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.272