Validation of viewstate MAC failed

Validation of viewstate MAC failed. 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.

If your seeing this error, this can usually be resolved by defining the machine key in your application web.config.
You can generate your own machine key by following the instructions here.

<configuration>
<system.web>
<machineKey ... />
</system.web>
</configuration>


If your still seeing issues, please don't hesitate to contact support for further assistance.

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  • viewstate, mac
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