Validation of viewstate MAC failed

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Hello EveryOne..

I have hosted my ASP.NET web application on server and its working fine. but sometimes when i try to browse pages, i get follwing error

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.

Can anyone knows the Reason and Solution of this error..???

Thanks in Advance..

Posted 19-Apr-12 1:16am

Bijesh Nair

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Mohamed Mitwalli · Answer 1 · 2012-04-19T01:22:00

Solution 1

Hi ,
Check this one
Here[^]
Best Regards
M.Mitwalli

Posted 19-Apr-12 1:22am

Mohamed Mitwalli

Ashish Sehajpal · Answer 2 · 2012-04-22T22:30:00

Put the same machinekey on all the servers (usually it happens when application is hosted on multiple servers in a cluster or webfarm)

P.S. - the machinekey will go inside System.web section in web.config.

XML

<system.web>

        <machineKey validationKey=’3AE041467624C0947FE562E2DBE6122B532FBC4AA9845AE3D82EC6AC473104EA40A27F8E89BADDAEE44B1F7582FC47299B674ED1FD2DDE1368710504EB2C54C1′ decryptionKey=’2FC79A393A5A463F82D38828F43ED7D030C418B448C9E76C’ validation=’SHA1′/>

    </system.web>