validation of viewstate mac failed. ensure the same validation key and validation algorithm .autogenerate can not be used in cluster

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i have getting this error ...

"validation of viewstate mac failed. if this application is hosted by a web farm or cluster ensure the same validation key and validation algorithm .autogenerate can not be used in cluster"

i have googled very much and i also read the question which is posted before on code project .But nothing is worked in my case , my application is hosted on a VPN. and i am using framework 4.0 .

and things that i tried are ...

XML

<pages controlrenderingcompatibilityversion="3.5" clientidmode="AutoID" validaterequest="false" enableviewstatemac="false" enableeventvalidation="false" viewstateencryptionmode="Never" />

and also tried this or both ...

XML

<machineKey validationKey="EAE9A8ECB918758B45CC829F69A13C1E9F34CD37B0BB9D1D7CAA99F1F967C401BB869F03CC5A229C5D4EE15681A8E681EBD1B894BDEFA26ECD7EB693E639995D"
  decryptionKey="66B8AB89349754CA229B5EFAC9DE572E939D1DA8EF28F389D3D6347FDC66CD67" validation="SHA1" decryption="AES" />

please suggest fnds something what to do ...

Posted 8-Jul-15 20:09pm

Gaurav Dixit

Updated 8-Jul-15 22:00pm

Suvendu Shekhar Giri

v8

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Comments

Ben J. Boyle 9-Jul-15 10:30am

Don't know if this will help you but try taking out enableviewstatemac="false" from your code - a security update from MS has removed support and it might be causing you issues.

http://blogs.msdn.com/b/webdev/archive/2014/09/09/farewell-enableviewstatemac.aspx

Your machine key entry looks to be OK, and that's all we've needed to configure on our farm enabled projects.

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