Validation Of Viewstate MAC failed

Question

Hi All,
 
I am getting bellow error some times while running the application at production server. When running the same application at test server it working fine.
 
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.
 
I have found this while googling. it is using the following in the web.config of
website: enableViewStateMac="false" viewStateEncryptionMode="Never" enableEventValidation="false"
 

Is there any other way to fix this. Is there something in IIS or the web.config I can set to stop this message randomly coming up?

Answer 1

Hi,

Does it help if you follow the steps in the following article:

How to fix “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”
http://www.shnake.com/blog/?p=604

Hope this helps, thanks.

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