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: [No relevant source lines]
Source File:
... Line: 0
Stack Trace:
[ViewStateException:
Invalid viewstate.
Client IP:
::1
Port: 40653
Referer:
http://localhost:40643/MyPage.aspx
Path:
/MyPage.aspx
User-Agent:
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)
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.
See
http://go.microsoft.com/fwlink/?LinkID=314055 for more information.]
System.Web.UI.ViewStateException.ThrowError(Exception
inner, String persistedState, String errorPageMessage, Boolean
macValidationError) +190
System.Web.UI.ViewStateException.ThrowMacValidationError(Exception
inner, String persistedState) +46
System.Web.UI.ObjectStateFormatter.Deserialize(String
inputString, Purpose purpose) +861
System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter2.Deserialize(String
serializedState, Purpose purpose) +51
System.Web.UI.Util.DeserializeWithAssert(IStateFormatter2
formatter, String serializedState, Purpose purpose) +67
System.Web.UI.HiddenFieldPageStatePersister.Load()
+444
System.Web.UI.Page.LoadPageStateFromPersistenceMedium()
+368
System.Web.UI.Page.LoadAllState()
+109
System.Web.UI.Page.ProcessRequestMain(Boolean
includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +7959
System.Web.UI.Page.ProcessRequest(Boolean
includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +429
System.Web.UI.Page.ProcessRequest()
+125
System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext
context) +48
System.Web.UI.Page.ProcessRequest(HttpContext
context) +234
ASP.mypage_aspx.ProcessRequest(HttpContext
context) in ...:0
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
+1300
System.Web.HttpApplication.ExecuteStep(IExecutionStep
step, Boolean& completedSynchronously) +140
Resolve this issue you can add a <machineKey> element, in the
Web.config file. The <machineKey> element is only valid in the Web.config
file at the root of your application and is not valid at the subfolder level.
<configuration>
<system.web>
<machineKey ...
/> (add below machineKey in
system.web section)
</system.web>
</configuration>
<machineKey
validationKey="20A1D0BF6A9C13FC54FAFAE5534D586F78A50005223F08C0C8AD0704CCF27C29E6F41C30FA03D9E418F7EBB38BFDAC698545C39200C39A622BE22EBC6C10BEE8"
decryptionKey="CD0F6DC238FD884B009B3C5E3163726F58C4D51FE82908E9F1504BF50D95075D"
validation="SHA1"
decryption="AES"/>
