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Message: <blockquote data-quote="Fox92" data-source="post: 25042160" data-attributes="member: 548631">DataBase and application connect successfully.sometimes can log into web application with providing details. get an error called "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. "[CODE][ViewStateException: Invalid viewstate.     Client IP: 112.134.47.103    Port: 10091    Referer: https://testorigin.xyz.lk/StaffLogin.aspx    Path: /StaffLogin.aspx    User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.88 Safari/537.36    ViewState: iBIlfxyvZMZ8tyv/kpglGOh38/vTCqm2tCzOHzBFaYzN6kqMia09f9KdDEEUV8hq73S5u0LWPcJybEBfB8rLlT6EsYGhKDjVtB8v/kwtEWk=][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) +153   System.Web.UI.ObjectStateFormatter.Deserialize(String inputString, Purpose purpose) +896   System.Web.UI.Util.DeserializeWithAssert(IStateFormatter2 formatter, String serializedState, Purpose purpose) +61   System.Web.UI.HiddenFieldPageStatePersister.Load() +305   System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +367   System.Web.UI.Page.LoadAllState() +46   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +9458   System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +345   System.Web.UI.Page.ProcessRequest() +75   System.Web.UI.Page.ProcessRequest(HttpContext context) +70   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +790   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +195   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +88[/CODE]</blockquote>

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