How to solve Validation Of Viewstate MAC Failed error in ASP.NET

Validation Of Viewstate MAC Failed

If you are looking solution for one of the weird 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 can feel your pain. Few days back I was on same position where you are standing now. I was stuck and clearly had no Idea why application getting this error on only some pages where whole application was working fine.

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