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

In order to Solve the Issue open IIS manager , In the left pane Click on the website for which you are facing problem,

In the right Pane Click on Machine Key , Click on generate Keys and click Apply . Your issue will be sorted.

 

Validation

validation1

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