Validation of viewstate MAC failed

Solution

I copied a whole Sitecore 8 solution to a server. I think to copy the "Data" Folder and viewstate folder is NOT an good idea. So I deleted the viewstate, gave permissions to the data folder AND did a iisreset in the cms.exe which was started as Adminstrator!

That solved my problem.
Hope this helps.

Server Error in '/' 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: 172.20.10.1
 Port: 46012
 Referer: http://autohaus.....
 Path: /sitecore/login
 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:37.0) Gecko/20100101 Firefox/37.0
 ViewState: 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...]

[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) +12436256
   System.Web.UI.ObjectStateFormatter.Deserialize(String inputString, Purpose purpose) +12327715
   System.Web.UI.Util.DeserializeWithAssert(IStateFormatter2 formatter, String serializedState, Purpose purpose) +67
   System.Web.UI.HiddenFieldPageStatePersister.Load() +12327927
   System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +12580515
   System.Web.UI.Page.LoadAllState() +51
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +12573463
   System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +12572973
   System.Web.UI.Page.ProcessRequest() +119
   System.Web.UI.Page.ProcessRequest(HttpContext context) +99
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +913
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +165


           
Location: Baden, Schweiz

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