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I am facing the following error, "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 know this is a repeated question, but i am unable to find the solution.

Usf Noor
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  • Possible duplicate of [Validation of viewstate MAC failed.Application hosted by a Web Farm, ensure configuration](http://stackoverflow.com/questions/17398954/validation-of-viewstate-mac-failed-application-hosted-by-a-web-farm-ensure-mac) – Rajeesh Menoth Aug 05 '16 at 05:50
  • Add machine key in web config!! – Rajeesh Menoth Aug 05 '16 at 05:51

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