[ViewStateException: Invalid viewstate.
Client IP: 24.5.236.111
Port: 55549
Referer: http://www.finebytes.com/mfr/Activate.aspx
Path: /mfr/Activate.aspx
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36
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.
See http://go.microsoft.com/fwlink/?LinkID=314055 for more information.]
System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError) +116
System.Web.UI.ObjectStateFormatter.Deserialize(String inputString, Purpose purpose) +425
System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter2.Deserialize(String serializedState, Purpose purpose) +13
System.Web.UI.Util.DeserializeWithAssert(IStateFormatter2 formatter, String serializedState, Purpose purpose) +40
System.Web.UI.HiddenFieldPageStatePersister.Load() +248
System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +251
System.Web.UI.Page.LoadAllState() +36
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +6569
System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +245
System.Web.UI.Page.ProcessRequest() +72
System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +22
System.Web.UI.Page.ProcessRequest(HttpContext context) +58
ASP.mfr_activate_aspx.ProcessRequest(HttpContext context) in c:\windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\5d9cf2c1\d041237\App_Web_clpvvbvj.22.cs:0
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +188
System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +48
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +71
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