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Editorial Team
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Asked: 2026-05-20T08:40:30+00:00

I have a simple aspx page with one grid view. When deployed on server,

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I have a simple aspx page with one grid view. When deployed on server, and accessed through that machine, it works fine. However, when connected through load balancer, we get this error ( when click on any button). The page however refreshes when pressed F5.

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.

Any idea what is happening here???

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1 Answer

  1. Editorial Team

    Added enableViewStateMAC = false on the page directive

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