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.

I got this error when migrating my application from Windows XP to Window 7. Moreever I get this error when I run the application on IIS 7.5 but strangely don’t get this error if you run the website from Visual Studio 2008 (on Win7 Machine).

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