Validation of viewstate MAC failed. If hosted by a Web Farm or cluster

Last Reply on Apr 04, 2016 04:46 AM By Shashikant

Posted on Apr 04, 2016 04:45 AM

Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

how to solve this problem in web.config

please help me

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