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Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that 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.

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.<br><br>See http://go.microsoft.com/fwlink/?LinkID=314055 for more information.

Server Error in '/Portal' 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.

See http://go.microsoft.com/fwlink/?LinkID=314055 for more information.

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.

See http://go.microsoft.com/fwlink/?LinkID=314055 for more information.

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: 178.169.1.119
	Port: 22083
	Referer: http://naciportal.isiri.gov.ir/Portal/home/?94629/%D8%A2%D8%B2%D9%85%D8%A7%DB%8C%D8%B4%DA%AF%D8%A7%D9%87-%D9%87%D8%A7%DB%8C-%D8%A2%D8%B2%D9%85%D9%88%D9%86-%D8%AA%D8%A7%DB%8C%DB%8C%D8%AF-%D8%B5%D9%84%D8%A7%D8%AD%DB%8C%D8%AA-%D8%B4%D8%AF%D9%87-%D8%A8%D8%B1-%D8%A7%D8%B3%D8%A7%D8%B3-%D8%A7%D8%B3%D8%AA%D8%A7%D9%86%D8%AF%D8%A7%D8%B1%D8%AF-17025
	Path: /Portal/Home/Default.aspx
	User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36
	ViewState: LSRoOv9hZ1+bAEXGBc5u8A3IUV7ceEC1nJ6DB/GNct1WHc7n8KTsdceJ0U4iEHah6YguqTDamNMP7XbDydJzmBftCJvff3nO27CR9kKJ0/RQV1uLz0w0V1Hk09kqsdJVd8IYuiVDm3PrtskRYC2x1wP1gJeNNyGA5lwlZcDQX1jy9nvJGa2e2a0j5Cc8Y0lXCGn8cRxT3z5ik0lswFTvRoD4zbrz1NZSfJD6oeK+uL6SIoAOT7F6SOi3wDA5CxVKEtnTphisJ/MgvrrrrOvviL66aJkyf76R4rURcDdBqaCaEj0KkAiV8KmesqLjNg/HljtCBONbWhdK6CUCBKWZozUQiKl0enUHX1s/MpFqrLWd7nsVQs0e+o4MgMkENo1jlt8Eo5emEbjKM9nZVIu5ev/PJ0M1Vj1xXKBNUturX/KEwj9AewN7dGWCsucT8PdyA49...]

[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.HttpContext.InvokeCancellableCallback(WaitCallback callback, Object state) +92
   System.Web.UI.Page.LegacyAsyncPageBeginProcessRequest(HttpContext context, AsyncCallback callback, Object extraData) +487
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +1020
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +195
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +128

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