Dotnet Validation of viewstate MAC failed?

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Dotnet Validation of viewstate MAC failed?
Question Posted on 20 Oct 2021

Home >> DotNet >> ASP.NET >> Dotnet Validation of viewstate MAC failed?

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

Viewstate Mac error

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