Dotnet Validation of viewstate MAC failed?

1.	Dotnet Validation of viewstate MAC failed?
Answer» Dotnet Validation of viewstate MAC failed? Some time we will get error LIKE below given in viewstate MAC failed:- Sys.WebForms.PageRequestManagerServerErrorException: 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. Below are the some option to resolve this

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